Observation arc

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Notion

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Science and technology

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What Wikipedia says

In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly used in the discovery and tracking of asteroids and comets.

Excerpt from the Wikipedia article “Observation arc”, under the CC BY-SA 4.0 license. Read the article on Wikipedia