Convert hour (sidereal) to day
Please provide values below to convert hour (sidereal) [None] to day [d], or Convert day to hour (sidereal).
How to Convert Hour (Sidereal) to Day
1 None = 0.0415528984953704 d
Example: convert 15 None to d:
15 None = 15 × 0.0415528984953704 d = 0.623293477430556 d
Hour (Sidereal) to Day Conversion Table
| hour (sidereal) | day |
|---|
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.
Day
A day is a unit of time representing the period of one complete rotation of the Earth on its axis, typically lasting 24 hours.
History/Origin
The concept of a day has origins in ancient civilizations observing the cycle of day and night. The 24-hour day was standardized in the modern era, with the division into hours dating back to ancient Egypt and further refined through the adoption of mechanical clocks.
Current Use
The day is used universally to measure time intervals, schedule activities, and organize daily life, with the 24-hour system being the standard in most countries worldwide.