Proper motion

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Proper motion is the angular speed of an astronomical object, such as a star, as it moves across the sky. It is an astrometric measure, giving an object's change in angular position over time relative to the center of mass of the Solar System.

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

Image: Ivan Ramirez, CC BY 4.0, via Wikimedia Commons.