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拱点

File:Apogee_(PSF)_mul.svg · Wikimedia Commons · See Wikimedia Commons

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拱点

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Also known as apsides, apse

lang=zxx|thumb|345px|The apsides refer to the farthest (2) and nearest (3) points reached by an orbiting planetary-mass object|planetary body (2 and 3) with respect to a primary, or host, body (1) An apsis ( (third declension); ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values.

AI overview

An apsis is either the farthest or nearest point that an orbiting body—like a planet or moon—reaches as it travels around its primary body, such as a star or planet. The two apsides of an orbit are connected by a line called the line of apsides, which represents the longest diameter of the orbit.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

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Apogee (PSF) mul.svg
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described by source
Encyclopædia Britannica 11th edition
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astronomy
on focus list of Wikimedia project
Wikipedia:Vital articles/Level/4
has contributing factor
orbital elements
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Article · 中文

拱點（apsis，複數為apsides）是指一个物体的运动轨道的极端点；在天文學中，这个词是指在橢圓軌道上運行的天體最接近或最遠離它的引力中心（通常也就是系統的質量中心）的點。 最靠近引力中心的點稱為近拱點（periapsis）或近心點（pericenter），而距離最遠的點就稱為遠拱點（apoapsis）或遠心點（apocenter）。連接近拱點和遠拱點的直線稱為拱點線，是橢圓的長軸，也是橢圓內最長的直線段。 連接近拱點與遠拱點的直線稱為拱點線。橢圓的長軸與拱點線同線。 以下是用於辨識橢圓軌道的項目： * 在環繞地球的軌道上，最常用的是近地點（perigee）和遠地點（apogee）。 * 在環繞太陽的軌道上，最常用的是近日點（perihelion）和遠日點（aphelion）。 * 在阿波羅計畫中，環繞月球的軌道上，最常用的是近月點（pericynthion）和遠月點（apocynthion）。

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