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Daylight Calculator
Estimate the hours of daylight at a latitude on any day of the year.
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Daylight
Compare Your Options And Get Clear Answers
Estimate the hours of daylight at a latitude on any day of the year.
Daylight Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Daylight = 2 acos(-tan lat tan decl) / 15.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Daylight Quick Guide
Typical values for reference.
| Latitude | Day | Daylight | |
|---|---|---|---|
| 51.5 | 355 | 7 h 36 min | |
| 51.5 | 172 | 16 h 24 min | |
| 0 | 172 | 12 h 0 min | |
| 60 | 355 | 5 h 31 min | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Daylight Calculator FAQ
Answers to common questions about this calculator.
It depends on latitude and the date.
Around 21 June in the north.
Earth axial tilt.
Within about 10 minutes.