사용자:Astor/작업장3: 두 판 사이의 차이

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Astor (토론 | 기여)
Astor (토론 | 기여)
87번째 줄:
 
==측성학의 응용==
[[Image:orbit3.gif|thumb|right|200px|어떻게 큰 질량의 별 주위를 공전하고 있는 [[외계행성]] 같이 작은 물체가 별의 위치와 속도변화를 일으킬 수 있는지 보여주는 그림. 무거운 별과 가벼운 행성 모두 공통 질량중심(붉은색 십자가)를 중심으로 공전하고 있다.]]
[[Image:orbit3.gif|thumb|right|200px|Diagram showing how a smaller object (such as an [[:en:extrasolar planet|extrasolar planet]]) orbiting a larger object (such as a [[:en:star|star]]) could produce changes in position and velocity of the latter as they orbit their common [[:en:center of mass|center of mass]] (red cross).]]
 
[[Image:Solar system barycenter.svg|thumb|right|200px|Motion of [[:en:Barycentric coordinates (astronomy)|barycenter]] of solar system relative to the Sun.]]
[[Image:Solar system barycenter.svg|thumb|right|200px|태양계 전체의 [[질량중심]]의 시간에 따른 이동 모습.]]
 
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]].