Convert hour to hour (sidereal)
Please provide values below to convert hour [h] to hour (sidereal) [None], or Convert hour (sidereal) to hour.
How to Convert Hour to Hour (Sidereal)
1 h = 1.00273791180437 None
Example: convert 15 h to None:
15 h = 15 × 1.00273791180437 None = 15.0410686770656 None
Hour to Hour (Sidereal) Conversion Table
| hour | hour (sidereal) |
|---|
Hour
An hour is a unit of time equal to 60 minutes or 3,600 seconds.
History/Origin
The hour has origins in ancient civilizations, notably the Babylonians, who divided the day into 24 hours. The modern 24-hour system was standardized in the 14th century and became widely adopted with the advent of mechanical clocks.
Current Use
Hours are used globally to measure and schedule time in daily life, work, transportation, and various scientific and technical applications.
Hour (Sidereal)
An hour (sidereal) is a unit of time based on the Earth's rotation relative to distant stars, equal to approximately 3,894 seconds, used primarily in astronomy.
History/Origin
The sidereal hour originated from the ancient division of the day based on Earth's rotation relative to the stars, differing from the solar hour by about 4 minutes, and has been used historically in astronomy for precise timekeeping.
Current Use
Sidereal hours are mainly used in astronomy and astrophysics to measure celestial events and the Earth's rotation relative to distant celestial objects, rather than in everyday timekeeping.