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Astronomy Calculators
3 calculators|3 categories
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🔭3 Astronomy Calculatorsin 3 categories
Lunar & Observation🌙
Lunar
1Moon phase calculations, illumination, synodic period, days to full/new moon.
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Observation
1Star visibility, Bortle scale, limiting magnitude, telescope aperture, light pollution.
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Solar System
1Asteroid impact energy, Torino Scale, crater size, planetary defense. NASA Impact Earth model.
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Did You Know?
The synodic month (new moon to new moon) is 29.53 days—longer than the orbital period because Earth moves around the Sun.
In Bortle Class 1 skies, the naked eye can see stars down to magnitude ~6. A 100mm telescope reaches ~12.7 mag.
A full moon can reduce your limiting magnitude by ~2, washing out fainter stars. Best observing: new moon + dark sky.
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