사용자:Astor/작업장3: 두 판 사이의 차이
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==측성학의 응용==
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Apart from the fundamental function of providing [[:en:astronomer|astronomer]]s with a [[:en:Frame of reference|reference frame]] to report their observations in, astrometry is also fundamental for fields like [[:en:celestial mechanics|celestial mechanics]], [[:en:stellar dynamics|stellar dynamics]] and [[:en:galactic astronomy|galactic astronomy]]. In [[:en:observational astronomy|observational astronomy]], astrometric techniques help identify stellar objects by their unique motions. It is instrumental for keeping time, in that [[:en:Coordinated Universal Time|UTC]] is basically the [[:en:International Atomic Time|atomic time]] synchronized to [[:en:Earth|Earth]]'s rotation by means of exact observations. Astrometry is an important step in the [[:en:cosmic distance ladder|cosmic distance ladder]] because it establishes [[:en:parallax|parallax]] distance estimates for stars in the [[:en:Milky Way|Milky Way]].
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