IERS Reference Meridian

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

The IERS Reference Meridian (IRM), also called the International Reference Meridian, is the prime meridian (0° longitude) maintained by the International Earth Rotation and Reference Systems Service (IERS).

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

Image: Image by ChrisO, CC BY-SA 3.0, via Wikimedia Commons.