Prime meridian

Rarity: Rare

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

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Notion

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Science and technology

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What Wikipedia says

A prime meridian is a meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. On a spheroid, a prime meridian and its anti-meridian (the 180th meridian in a 360-degree system) form a great ellipse.

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

Image: Gerardus Mercator, Public domain, via Wikimedia Commons.