Universal Time
Time standard based on the Earth's rotation
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult.
Nº Q874572 ★★★★★
Ultra Rare · Literature
Universal Time
Time standard based on the Earth's rotation
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult.
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From Wikipedia
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle (ERA, which serves as the replacement for Greenwich Mean Sidereal Time). UT1 is the same everywhere on Earth. UT1 is required to follow the relationship where Tu = (Julian UT1 date − 2451545.0).
Text: Wikipédia, CC BY-SA 4.0. ·
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