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Star Trail Length Calculator
Work out star trail arc length for a long exposure.
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Work out star trail arc length for a long exposure.
Star Trail Length Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Arc = 0.25° per minute x cos(dec).
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
Star Quick Guide
Typical values for reference.
| Minutes | Focal mm | Dec factor | Arc ° |
|---|---|---|---|
| 10 | 24 | 1 | 2.5° |
| 30 | 24 | 1 | 7.5° |
| 60 | 24 | 1 | 15.0° |
| 240 | 24 | 0.7 | 42.1° |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Star Trail Length Calculator FAQ
Answers to common questions about this calculator.
Rotation.
It gives a quick estimate of star trail length from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.