Last Updated：2025/11/21

(astronomy) The change in apparent position of a celestial body due to that body's velocity relative to the Sun.

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proper motion

Source Word

proper motion

(astronomy) The change in apparent position of a celestial body due to that body's velocity relative to the Sun.

Japanese Meaning

固有運動 – 天体が太陽に対して持つ相対速度により、その見かけの位置が時間とともに変化する現象を指す。

The star's proper motion was carefully measured over several decades to refine its trajectory.

その星の固有運動は、軌道をより正確にするために数十年にわたって注意深く測定された。

Sense（1）

(astronomy) The change in apparent position of a celestial body due to that body's velocity relative to the Sun.

proper motions

（ plural ）