#universal_time
Universal Time
Time standard based on the slowing rotation of the Earth
Universal Time 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. UT1 is the same everywhere on Earth. UT1 is required to follow the relationshipERA = 2π(0.7790572732640 + 1.00273781191135448 · Tu) radians
Fri 16th
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