Nocturnal

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

A nocturnal is an instrument used to determine the local time based on the position of a star in the night sky relative to the pole star. As a result of the Earth's rotation, any fixed star makes a full revolution around the pole star in 23 hours and 56 minutes and therefore can be used as an hour hand.

Excerpt from the Wikipedia article “Nocturnal (instrument)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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