Sunlit Design > InfoSearch > Equivalence of Minutes of Time and Degrees of Rotation
Index: A-D, E-R, S-Z
A
- Accuracy of Sundials
- A.D. Years
- Altitude, Solar
- Angle above Horizon, Solar
- Apparent Time
- "Astronomical Algorithms"
- Astronomical Calculations, Time Basis of
- Azimuth, Solar
- Daylight Saving Time
- Declination, Solar
- Degrees, Minutes and Seconds
- Degrees of Rotation
- Dynamical Time
Equivalence of Minutes of Time and Degrees of Rotation
A complete rotation of the earth may be equated with 24 hours of True Time. Because of this, measures of time and measures of angle are interchangeable. The period of 1 day is equal to 1 rotation therefore all the following identities hold:| Time measure | Angle Measure |
| 1 Day | 360 Degrees |
| 1 Hour | 15 Degrees |
| 4 Minutes | 1 Degree |
| 1 Minute | 0.25 Degree |
Example
3 degrees 30 minutes of the earth's rotation is equivalent to how many minutes?
3.5 degree * 4 minutes/degree = 14 minutes.
Calculate it!
The Sun API provides the sdD2Unit and sdUnit2D functions that will convert between Degrees and Time and back.