Libration

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

In collections

Nobody has pulled it yet.

What Wikipedia says

In lunar astronomy, libration is the cyclic variation in the apparent position of the Moon that is perceived by observers on the Earth and caused by changes between the orbital and rotational planes of the Moon. It causes an observer to see slightly different hemispheres of the surface at different times.

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

Image: Tomruen, Public domain, via Wikimedia Commons.