Day Length From Latitude
Calculator
Sunrise/sunset hour angle (degrees)
115.694193
Results
- Sunrise/sunset hour angle (degrees)
- 115.694193
- Daylight duration (hours)
- 15.425892
- Night duration (hours)
- 8.574107
Astronomy results
| Sunrise/sunset hour angle (degrees) | 115.694193 |
| Daylight duration (hours) | 15.425892 |
| Night duration (hours) | 8.574107 |
formula-map diagram
- Sunrise/sunset hour angle (degrees)
- 115.694193
- Daylight duration (hours)
- 15.425892
- Night duration (hours)
- 8.574107
Astronomical relationship
Formula
H₀ = arccos(−tan(lat)·tan(decl)); daylight (h) = 2H₀ / 15°= 115.69419309892
Note
This result is a simplified model: it applies the displayed textbook formula to the values you entered, assuming ideal spherical bodies, circular orbits, blackbody radiation and perfect optics, and ignoring atmospheric seeing, relativistic corrections beyond those stated, cosmological models and measurement uncertainty. Use published ephemerides and catalogue data for real observations.