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1 Celestial Meridian | COSMOS
https://astronomy.swin.edu.au/cosmos/c/Celestial+Meridian
The meridian is an imaginary great circle on the celestial sphere that passes through the north and south celestial poles and an observer's zenith. The upper ...
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2 celestial meridian | astronomy | Britannica
https://www.britannica.com/science/celestial-meridian
The observer's meridian is a great circle on the celestial sphere that passes through the north and south points of the horizon as well as through the zenith of ...
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3 Definition of Meridian in Astronomy for Measurement
https://planetfacts.org/meridian/
Meridian astronomy, in particular, is used to make correct measurements in the sky so that celestial bodies (stars, planets, etc.) can be charted – an  ...
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4 Meridian astronomy | Royal Museums Greenwich
https://www.rmg.co.uk/stories/topics/meridian-astronomy
Meridian astronomy is the branch of astronomy concerned with making accurate measurements of positions (right ascension and declination) in the sky.
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5 Meridian definition and meaning | Collins English Dictionary
https://www.collinsdictionary.com/us/dictionary/english/meridian
meridian in American English · 1. Geography. a. · 2. Astronomy. the great circle of the celestial sphere that passes through its poles and the observer's zenith.
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6 Definitions | Astronomy 801: Planets, Stars, Galaxies, and the ...
https://www.e-education.psu.edu/astro801/content/l1_p2.html
Meridian - The vertical circle which passes through the north and south points. Horizon Coordinate System, Part A (Definitions show above).
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7 Meridian (astronomy) - Encyclopedia - The Free Dictionary
https://encyclopedia2.thefreedictionary.com/Meridian+(astronomy)
a great circle of the celestial sphere passing through the celestial poles and the zenith of the observing site. The celestial meridian intersects the ...
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8 meridian - Wiktionary
https://en.wiktionary.org/wiki/meridian
NounEdit · (astronomy). In full celestial meridian: a great circle passing through the poles of the celestial sphere and the zenith for a particular point on the ...
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9 What is a meridian? | Macmillan Dictionary Blog
https://www.macmillandictionaryblog.com/meridian
In astronomy, the word is often used because at noon the sun crosses the meridian, although this rarely corresponds to measured clock time on Earth.
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10 Meridian (astronomy) | Wikipedia audio article - YouTube
https://www.youtube.com/watch?v=-Un2Za3UJrc
wikipedia tts
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11 * Meridian (Astronomy) - Definition - Lexicon & Encyclopedia
https://en.mimi.hu/astronomy/meridian.html
Astronomy · Celestial Meridian · celestial meridian · Celestial Meridian: Great Circle passing North-South through the North Celestial Pole (NCP) and South ...
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12 When Does the Earth's Prime Meridian Line Up With the ...
https://public.nrao.edu/ask/when-does-the-earths-prime-meridian-line-up-with-the-celestial-meridian/
Definition for “Celestial Meridian” which I am using from Dictionary.com below: “In the equatorial coordinate system, a great circle on the ...
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13 Introduction to Principles of Astronomy
https://gml.noaa.gov/ozwv/dobson/papers/report6/apph.html
A meridian circle is any circle on the surface of the earth passing through both the north and south poles. The longitude of a station is defined as the angular ...
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14 Meridian - In-The-Sky.org
https://in-the-sky.org/article.php?term=meridian
The observer's local sidereal time is defined as the right ascension of stars which lie along the observer's local meridian at any moment in time.
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15 Sun crosses your meridian at noon | Astronomy Essentials
https://earthsky.org/astronomy-essentials/sun-crosses-meridian-at-noon/
In the jargon of astronomers and celestial navigators, your local meridian is an imaginary semi-circle that crosses your sky's dome from due ...
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16 meridian - definition and meaning - Wordnik
https://www.wordnik.com/words/meridian
noun Astronomy A great circle passing through the two poles of the celestial sphere and the zenith of a given observer. noun A curve on a surface of revolution, ...
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17 What does MERIDIAN, ASTRONOMICAL mean?
https://www.definitions.net/definition/MERIDIAN%2C+ASTRONOMICAL
› definition › MERIDIAN,+...
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18 Lecture 1: Introduction to Astronomy 250
http://ircamera.as.arizona.edu/astr_250/Lectures/LECTURE_01.HTM
The celestial poles and equator are the projections of the Earth's poles and equator onto the sky. The meridian is the circle running from one pole to the other ...
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19 Moon Glossary: Lunar Terms and Definitions
https://www.almanac.com/content/moon-glossary-lunar-terms-and-definitions
A meridian is a location's longitude (a line that runs from the North Pole to the South Pole of Earth). When we use the word meridian, it's usually referring to ...
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20 Glossary
https://aa.usno.navy.mil/faq/asa_glossary
In The Astronomical Almanac, it is the plane defining the astronomical zero meridian; it contains the geocenter, the Celestial Intermediate Pole and the ...
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21 Astronomy 100 -- Earth & Sky Coordinates
https://spaces.imperial.edu/russell.lavery/astr100/lectures/ASTR100Topic01.html
Zenith -- Point on the Celestial Sphere directly overhead · Meridian -- Imaginary line connecting the poles passing through the zenith. · Altitude -- Angular ...
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22 Prime Meridian | National Geographic Society
https://www.nationalgeographic.org/encyclopedia/prime-meridian/
The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around Earth.
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23 Celestial Meridian | Encyclopedia.com
https://www.encyclopedia.com/science-and-technology/astronomy-and-space-exploration/astronomy-general/celestial-meridian
▫ (also celestial meridian) Astron. a circle passing through the celestial poles and the zenith of a given place on the earth's surface. 2. (in ...
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24 Celestial Sphere
http://abyss.uoregon.edu/~js/ast122/lectures/lec02.html
A more convenient coordinate system for cataloging purposes is one based on the celestial equator and the celestial poles and defined in a similar manner to ...
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25 Definition of "meridian transit" - Heavens-Above
https://www.heavens-above.com/glossary.aspx?cul=en&term=meridian+transit
The passage of the apparent centre of an object's disk through a meridian. The meridian is usually the observer's meridian, and the meridian transit is ...
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26 celestial meridian Definition in the dictionary English
https://glosbe.com/en/en/celestial%20meridian
In astronomy, hour angle is defined as the angular distance on the celestial sphere measured westward along the celestial equator from the meridian to the ...
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27 Meridian (astronomy)
https://en-academic.com/dic.nsf/enwiki/337767
In the sky, a meridian is an imaginary great circle on the celestial sphere. It passes through the north point on the horizon, through the celestial pole, ...
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28 Right Ascension & Declination: Celestial Coordinates for ...
https://skyandtelescope.org/astronomy-resources/right-ascension-declination-celestial-coordinates/
The prime meridian is an imaginary line that runs through the Royal Observatory in Greenwich, United Kingdom, and extends to the North and South ...
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29 How are cardinal points on horizon defined?
https://astronomy.stackexchange.com/questions/29535/how-are-cardinal-points-on-horizon-defined
Geographic Meridian Every point on Earth is on some meridian: A (geographical) meridian (or line of longitude) is the half of an imaginary great circle ...
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30 AST101: Common Astronomical Definitions
https://web.pa.msu.edu/courses/2003fall/AST101/Definitions.pdf
Measured from 0 to 24 hours (or 0 to 360°). Meridian. An imaginary line drawn on the celestial sphere (across the sky) that passes through the south horizon ...
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31 Equatorial - Astronomy 505
http://astronomy.nmsu.edu/nicole/teaching/ASTR505/lectures/lecture08/slide05.html
Defining the observer's meridian as the arc of the great circle which passes from the north celestial pole through the zenith to the south celestial pole, ...
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32 Meridian (geography) - GIS Wiki | The GIS Encyclopedia
http://wiki.gis.com/wiki/index.php/Meridian_(geography)
The term "meridian" comes from the Latin meridies, meaning "midday"; the sun crosses a given meridian midway between the times of sunrise and ...
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33 Definitions of meridian - OneLook Dictionary Search
https://www.onelook.com/?loc=olthes1&w=meridian
› w=meridian
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34 Astronomy Chapter 2 Flashcards - Quizlet
https://quizlet.com/59243565/astronomy-chapter-2-flash-cards/
The horizon is the boundary between the Earth and sky. The zenith is the point directly overhead; the meridian is an imaginary half circle stretching from the ...
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35 4.1 Earth and Sky – Astronomy - UCF Pressbooks
https://pressbooks.online.ucf.edu/astronomybc/chapter/4-1-earth-and-sky/
The longitude of the Prime Meridian is defined as 0°. Latitude and Longitude of Washington, DC. On this illustration of the Earth, roughly centered on the ...
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36 Glossary of Astronomy Terms - SeaSky.org
http://www.seasky.org/astronomy/astronomy-glossary.html
› ... › Astronomy Reference Guide
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37 What Is Solar Noon? - Time and Date
https://www.timeanddate.com/astronomy/solar-noon.html
Meridians and the Sun. A meridian is an imaginary line running from the North Pole to the South Pole along the Earth's surface. It connects all locations that ...
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38 Central meridian - Oxford Reference
https://www.oxfordreference.com/view/10.1093/oi/authority.20110803095558666
› view › authority.20...
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39 Mapping the Sky
https://ecampus.matc.edu/mihalj/astronomy/test1/mapping_the_sky.htm
Astronomers are always interested in knowing when objects are at or near the meridian because they are forced to view the sky through a thin atmosphere. However ...
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40 Definition:Meridian (Terrestrial) - ProofWiki
https://proofwiki.org/wiki/Definition:Meridian_(Terrestrial)
Definition. A (terrestrial) meridian is a semi-great circle on Earth's surface whose endpoints are Earth's poles. Meridians.png ...
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41 Positional Astronomy:
Sidereal Time

http://star-www.st-and.ac.uk/~fv/webnotes/chapter6.htm
We define one rotation of Earth as one sidereal day, measured as the time between two successive meridian passages of the same star.
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42 Automated Meridian Flip - Nighttime Imaging 'N' Astronomy
https://nighttime-imaging.eu/docs/master/site/advanced/meridianflip/
Mount operations known as Meridian Flips are important when using a German Equatorial Mount (GEM). The meridian is an imaginary line that divides the sky into ...
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43 Reverso - meridian plane definition | English definition dictionary
https://dictionary.reverso.net/english-definition/meridian+plane
meridian ; 1 ; 2 (Astronomy) ; 3 (Also called) meridian section (Maths) a section of a surface of revolution, such as a paraboloid, that contains the axis of ...
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44 Number of Results: 6 Search : ephemeris
https://dictionary.obspm.fr/index.php?showAll=1&formSearchTextfield=ephemeris
A fictitious meridian that rotates independently of the Earth at the uniform rate implicitly defined by → Terrestrial Dynamical Time (TDT). → ephemeris; → ...
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45 Prime Meridian GMT | Time - Space FM
https://www.space.fm/astronomy/earthmoonsun/primemeridian.html
... point along the Prime Meridian is defined as Greenwich Mean Time (GMT), ... In astronomy and space exploration it is especially useful as when events ...
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46 meridian - WordReference.com Dictionary of English
https://www.wordreference.com/definition/meridian
meridian · of or pertaining to a meridian. · Astronomyof or pertaining to midday or noon:the meridian hour. · of or indicating a period of greatest prosperity, ...
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47 Prime Meridian Lesson for Kids: Definition & Facts - Study.com
https://study.com/academy/lesson/prime-meridian-lesson-for-kids-definition-facts.html
Prime Meridian Lesson for Kids: Definition & Facts ... This line later was called the Prime Meridian. ... Ch 1. Overview of Astronomy for Elementary School.
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48 Celestial Sphere - NASA Solar System Exploration
https://solarsystem.nasa.gov/basics/chapter2-2/
It's defined to be the point where the sun crosses into the northern ... along the celestial equator from the observer's meridian to the object's RA.
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49 Meridian (astronomy) - Study in China 2023 - Wiki English
https://www.duhoctrungquoc.vn/wiki/en/Meridian_(astronomy)
In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location.
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50 Various Terms and Definitions used in Field Astronomy ...
https://civilengineering-softstudies.com/50-various-terms-and-definitions-used-in-field-astronomy-surveying.html
1. Celestial sphere: · 2. Zenith and Nadir : · 4. Celestial poles and Celestial equator: · 5. Sensible Horizon: · 7. Observer's meridian: · 9.
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51 Earth and Sky | Astronomy - Lumen Learning
https://courses.lumenlearning.com/suny-astronomy/chapter/earth-and-sky/
The longitude of the Prime Meridian is defined as 0°. Why Greenwich, you might ask? Every country wanted 0° longitude to pass through its own capital.
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52 What Is a Meridian Circle? (with picture) - Wise Geek
https://www.wise-geek.com/what-is-a-meridian-circle.htm
A meridian circle, also called a transit circle, is a device used in astronomy to measure the position of a star as it transits, or crosses, ...
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53 Meridian - Websters Dictionary 1828
https://webstersdictionary1828.com/Dictionary/meridian
Meridian · 1. In astronomy and geography, a great circle supposed to be drawn or to pass through the poles of the earth, and the zenith and nadir of any given ...
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54 Meridian vs Zenith : r/Astronomy - Reddit
https://www.reddit.com/r/Astronomy/comments/47mu14/meridian_vs_zenith/
meridian zenith In context|astronomy|lang=en terms the difference between zenith and meridian is that zenith is (astronomy) the highest point in the sky reached ...
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55 Astronomical Definitions - Geoscience Australia
https://www.ga.gov.au/scientific-topics/astronomical/astronomical-definitions
True north is the direction towards the north pole along the meridian of longitude which passes through the observer's position on the Earth. Vertical angle.
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56 4.1 Earth and Sky - Astronomy 2e | OpenStax
https://openstax.org/books/astronomy-2e/pages/4-1-earth-and-sky
The longitude of the Prime Meridian is defined as 0°. On this illustration of the Earth, roughly centered on the North Atlantic, lines of.
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57 About: Meridian (astronomy) - DBpedia
https://dbpedia.org/describe/?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FMeridian_%28astronomy%29
In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location.
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58 Astronomical Terms and Definitions Glossary
https://www.farmersalmanac.com/astronomy-glossary
Mer. – Meridian: A great circle on the celestial sphere passing through the north and south celestial poles and the zenith (overhead point) of a given place.
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59 Earth and Sky | Astronomy - Course Hero
https://www.coursehero.com/study-guides/astronomy/earth-and-sky/
By international agreement (and it took many meetings for the world's countries to agree), longitude is defined as the number of degrees of arc along the ...
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60 Why the Greenwich meridian moved | SpringerLink
https://link.springer.com/article/10.1007/s00190-015-0844-y
When the Royal Greenwich Observatory (RGO) astronomical station was moved from Greenwich to Herstmonceux in 1957, its photographic zenith tube ...
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61 Meaning of "meridian" in the English dictionary - Educalingo
https://educalingo.com/en/dic-en/meridian
Other definition of meridian is the great circle on the celestial sphere passing through the north and south celestial poles and the zenith and nadir of the ...
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62 Meridian Plane - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/meridian-plane
Meridian plane: It is defined as the plane PA passing through any point A on the surface and the North and South Poles. From: Spacecraft Collision Avoidance ...
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63 Celestial Equator - Astronomy Without a Telescope
https://www.astronomynotes.com/nakedeye/s4.htm
The positions of the zenith and meridian with respect to the stars will change as the celestial sphere rotates and if the observer changes ...
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64 The Meridian Circle - Universität Hamburg
https://www.physik.uni-hamburg.de/en/hs/outreach/tour/06-meridian.html
The Meridian Circle is an astronomical telescope, which pivots only North-South. With its help, one can define the transit time of a star through the ...
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65 Celestial meridian Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/celestial%20meridian
The meaning of CELESTIAL MERIDIAN is a great circle of the celestial sphere passing through the celestial poles and the zenith.
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66 Positional Astronomy: The terrestrial sphere
https://sceweb.sce.uhcl.edu/helm/WEB-Positional%20Astronomy/Tutorial/The%20terrestrial%20sphere/terrestrial%20sphere.html
for historical reasons, the zero-point is the meridian which passes through Greenwich (also called the Prime Meridian). The longitude of X is the angular ...
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67 Astronomy I – Vocabulary you need to know:
https://www.wallingford.k12.ct.us/uploaded/faculty/scvanciger//Microsoft_Word_-_AST1Vocab.pdf
Celestial equator – Is the great circle on the celestial sphere defined by ... Meridian - An imaginary north-south line in the sky that passes through the ...
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68 A brief history of time: What is it and how do we define it?
https://astronomy.com/magazine/news/2022/01/a-brief-history-of-time-what-is-it-and-how-do-we-define-it
To solve this, astronomers divided the globe into 24 time zones. The starting point for these time zones was based on the meridian defined by ...
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69 The Celestial Sphere - Planetary Sciences, Inc.
https://planetary-science.org/astronomy/the-celestial-globe/
In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth. All objects in the observer's ...
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70 Astronomical Dictionary - Astronomy Answers
https://www.aa.quae.nl/en/woordenboek.html
Astronomy is the science that studies everything outside of the Earth. This includes, among other things, the Moon, planets, Sun, stars, black holes, Milky Way, ...
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71 International Astronomical Center (IAC)
https://www.astronomycenter.net/glos.html
Meridian: a great circle passing through the celestial poles and through the zenith of any location on Earth. For planetary observations a meridian is half the ...
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72 Zoom Astronomy Glossary: A - Enchanted Learning
https://www.enchantedlearning.com/subjects/astronomy/glossary/
Airy installed a transit (a precise surveying device) at Greenwich, England, which was used to define the zero degree meridian of the Earth (zero-degrees ...
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73 Space Science Dictionary
https://www.msnucleus.org/membership/html/jh/earth/dictionary/spacedictionary.html
longitude (lon·gi·tude) noun - Longitude is the angular distance east or west of the prime meridian of a celestial object. lunar terrain - the appearance of the ...
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74 Advanced Surveying Chapter- 3 FIELD ASTRONOMY
https://ujjvalsolanki.files.wordpress.com/2014/04/field-astronomy.pdf
DEFINITION OF ASTRONOMICAL TERMS. (10)The Prime Vertical/ Prime Control. • It is Vertical Circle at 90ᵒ to observer's meridian on celestial.
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75 Meridian - American Heritage Dictionary Entry
https://www.ahdictionary.com/word/search.html?q=Meridian
INTERESTED IN DICTIONARIES? · 1. a. · 2. Astronomy A great circle passing through the two poles of the celestial sphere and the zenith of a given observer. · 3.
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76 Notes for Weeks 10-12, Astronomy 201 Spring 2021
http://bragi.physastro.mnsu.edu/~eskridge/astr201/week10.html
A Solar day is the length of time between consecutive meridian crossings of ... the Sidereal Time is the Hour Angle of the Vernal Equinox (by definition!)
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77 Understanding Astronomy: Motion of the Stars - Physics
https://physics.weber.edu/schroeder/ua/starmotion.html
All you have to do is travel directly north or south for some measured distance, and measure the angular shift of stars near the meridian. Since the North Star ...
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78 Meaning of «astronomical meridian - Arabic Ontology
https://ontology.birzeit.edu/term/astronomical+meridian
astronomical meridian- Meanings, synonyms translation & types from Arabic Ontology, a search engine for the Arabic Ontology and 100s of Arabic dictionaries ...
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79 Celestial Navigation
http://www.siranah.de/html/sail040e.htm
And like the Earth's Equator, the Celestial Equator divides the celestial sphere in a northern and southern celestial hemisphere. Similar to the Meridians and ...
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80 Chandra :: Resources :: Q&A: General Astronomy and Space ...
https://chandra.harvard.edu/resources/faq/astrophysics/astrophysics-25.html
Saying that the prime meridian passes through the galactic pole does ... This point is the spring or vernal equinox, which is defined as the ...
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81 The word meridian is a valid scrabble word
https://1word.ws/meridian
meridian n. (astronomy) A great circle passing through the poles of the celestial sphere and the zenith for a… 29 valid words from 3 definitions.
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82 Dictionary Astronomical updated in 2022
https://prismaticosastronomicos.com/en/diccionario-astronomico-glosario/
A dictionary of astronomy is a glossary of terms of reference, which provides detailed information about the objects, phenomena and celestial bodies that are ...
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83 Astronomy : Introduction : Lecture 2 : Motion of Stars and Sun
http://www.opencourse.info/astronomy/introduction/02.motion_stars_sun/
The celestial meridian is a semicircle connecting the celestial poles and passing through a particular point on the celestial equator called the ...
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84 GIS Dictionary - zenith| Definition - Esri Support
https://support.esri.com/en/other-resources/gis-dictionary/term/b732c10e-95f6-44a5-949f-6ac775cbcbc9
[astronomy] In astronomy, the point on the celestial sphere directly above an observer. Both the zenith and nadir lie on the observer's meridian; the zenith ...
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85 meridian line – Termwiki, millions of terms defined by people ...
https://en.termwiki.com/EN/meridian_line
The line in which the plane of the celestial meridian intersects the plane of the horizon. The astronomical azimuth of a meridian line is 0 o or 180 o .
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86 Longitude | Higgitt | Encyclopedia of the History of Science
https://lps.library.cmu.edu/ETHOS/article/id/451/
Longitude, as a geographical coordinate, identifies east-west position on Earth, with lines of longitude, or meridians, running from pole to pole.
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87 Astronomy Lecture Number 2 - NJIT
https://web.njit.edu/~gary/202/Lecture2.html
Thus, an altitude of 35d 27' 15" means an angle of 35 degrees, ... the zenith to the south point on the horizon, is called the meridian or local meridian.
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88 Celestial Coordinate System
https://www.pas.rochester.edu/~blackman/ast104/coordinates.html
› ast104 › coordinates
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89 Resources :: Q&A: General Astronomy and Space Science
https://chandra.si.edu/resources/faq/astrophysics/astrophysics-25.html
Saying that the prime meridian passes through the galactic pole does ... This point is the spring or vernal equinox, which is defined as the ...
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90 Meridian - what-when-how — In Depth Tutorials and Information
http://what-when-how.com/ancient-astronomy/meridian/
The meridian is a line running directly overhead across the sky, joining the north point on the horizon to the south point. Technically, it is defined as ...
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91 General Astronomy/The Celestial Sphere - Wikibooks
https://en.wikibooks.org/wiki/General_Astronomy/The_Celestial_Sphere
Since our observer is always on top of the Earth, the features on the celestial sphere that are defined relative to the ground will always be in the same ...
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92 Astronomical Definitions & Spherical Trigonometry by ... - Issuu
https://issuu.com/fieldastronomy/docs/astronomical_definitions___spherica
The north and south points are points caused by intersection of two great circles of the celestial meridian and celestial horizontal circle.
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93 Basic principles of celestial navigation
https://homepage.physics.uiowa.edu/~rlm/mathcad/AJP001418.pdf
Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242 ... Definition of latitude Φ and longitude Λ. (a) Meridian cross-section.
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94 CHAPTER 15 NAVIGATIONAL ASTRONOMY
https://thenauticalalmanac.com/Bowditch-%20American%20Practical%20Navigator/Chapt-15%20NAVIGATIONAL%20ASTRONOMY.pdf
the open sea lag behind the meridian transit of the Moon. For most navigational purposes, ... defined: civil, nautical and astronomical. See Table 1516.
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