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The **Small Angle Formula** calculator has three forms of the Small Angle Formula or Approximation.* Small Angle Equation*

where:

- (
**α**) is the angle - (
**s**) is the size - (
**d**) is the distance

Dr. Spicklemire has an instructional YouTube video on the using the Small Angle Equation (CLICK HERE).

Using the Small Angle Formula, you can compute:

The Small Angle Formula is part of the free online Astronomy Calculator built by Dr. Spicklemire.

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
*Small Angle Formula**α = S / D* - Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
- Relative Size Formulas
- Wavelength Formulas
- Luminosity and other Formulas