How does the Angular Size Calculator work?

Input actual size and distance Then: Calculate angular size in degrees, arcminutes, or arcseconds Then: Compare to other celestial objects.

Can you give an example of how to use the Angular Size Calculator?

Example: Input Moon: ~3476 km diameter, 384,000 km distance gives a result of Angular size ≈ 0.52° (match Sun size, hence solar eclipses).

Is the Angular Size Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Angular Size Calculator?

Our Angular Size Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Angular Size Calculator

Physical Size (km)

Distance (km)

Angular size (apparent size in sky) depends on object actual size and distance: θ ≈ size / distance (small angle approximation).

Difficulty:beginner

References

›Angular Size — Wikipedia

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