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of Earth's axis with rates of 50 arcseconds and 2 arcseconds respectively, per year;
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Apparent angular position of any star in the sky; point on the celestial sphere
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as seen from the moving Earth. Usually the mean places refer to a special
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and Tycho catalogue (110.000 and 2 million stars by space astrometry).
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coordinates of numerous stars are collected in catalogues like the
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and very precise coordinates of 1000-3000 stars are collected in
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359:, starting with the FK (Berlin ~1890) up to the modern FK6.
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The first and second effects are considered by so-called
214:(0 to 24 h). This is due to the observation technique of
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catalogue (USA 1966, 250.000 astrometric stars) or the
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The following factors change star positions over time:
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332:. The third effect has to be handled individually.
49:. Unsourced material may be challenged and removed.
369:(Germany 1859-1863, 342,198 rough positions), the
467:Jean Kovalevsky; P. Kenneth Seidelmann (2004).
462:How Astronomers describe the position of stars
8:
234:. The observation techniques are topics of
109:Learn how and when to remove this message
444:Bonner Sternverzeichnis - Dritte Section
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163:. The location is defined by a pair of
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488:Apparent Places of Fundamental Stars
47:adding citations to reliable sources
351:of different volume and accuracy.
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34:needs additional citations for
473:. Cambridge University Press.
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447:. Adolph Marcus. p. vii.
189:equatorial coordinate system
127:equatorial coordinate system
262:inertial frame of reference
247:Cartesian coordinate system
594:
470:Fundamentals of Astrometry
441:F.W.A. Argelander (1863).
347:are compiled in several
312:of the individual stars.
202:(from +90° at the north
206:to −90° at the south),
187:). This pair based the
400:Equatorial coordinates
357:fundamental catalogues
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367:Bonner Durchmusterung
124:
404:Ecliptic coordinates
320:, contrary to their
318:mean places of stars
236:positional astronomy
210:is usually given in
43:improve this article
422:transit instruments
335:The star positions
305:around the Sun; and
165:angular coordinates
418:Geodetic astronomy
134:
480:978-1-139-45317-2
409:annual aberration
328:, e.g. 1950.0 or
169:celestial equator
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280:axial precession
266:third coordinate
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232:Earth's rotation
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167:relative to the
157:arbitrary sphere
141:angular position
139:is the apparent
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310:proper motion
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303:Earth's orbit
301:– effects of
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260:refers to an
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245:Ideally, the
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226:of telescope
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224:field of view
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143:of any given
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60: –
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54:Find sources:
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32:This article
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557:Solar System
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240:astrogeodesy
198:is given in
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159:centered on
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41:Please help
36:verification
33:
545:Outer space
533:Spaceflight
212:hour angles
181:declination
573:Astrometry
567:Categories
428:References
295:aberration
99:March 2023
69:newspapers
509:Astronomy
375:Hipparcos
228:eyepieces
578:Position
381:See also
363:Relative
353:Absolute
299:parallax
284:nutation
270:distance
218:, which
155:onto an
495:Portals
286:– slow
238:and of
230:due to
200:degrees
147:in the
129:on the
83:scholar
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330:2000.0
264:. The
194:While
179:) and
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521:Stars
326:epoch
288:tilts
220:cross
161:Earth
153:fixed
90:JSTOR
76:books
475:ISBN
308:the
297:and
293:the
282:and
222:the
145:star
125:The
62:news
395:FK6
391:FK4
371:SAO
149:sky
45:by
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343:δ
339:α
337:(
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256:δ
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208:α
196:δ
185:δ
183:(
177:α
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