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Definitions from WordNet

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Sidereal Hour

Definition: A sidereal hour is a unit of time based on the rotation of the Earth in relation to the stars, equal to 1/24th of the Earth's sidereal day. It is approximately 3 minutes and 56 seconds shorter than a conventional hour.

Sense 1 (Noun): Refers to a standardized unit of time based on the Earth's rotational period as measured against the fixed stars.

Sample Sentence: The sidereal hour is commonly used in astronomy to measure the time it takes for a star or other celestial object to complete its apparent daily motion across the sky.

Sense 2 (Adjective): Describes phenomena or measurements related to sidereal hours.

Sample Sentence: The telescope's motorized mount can accurately track sidereal hour movements, allowing astronomers to capture long-exposure images of distant galaxies.

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