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The **Astronomy Calculator** includes functions that are useful for studying astronomy. Formulae are organized in different tabs to the right as follows: T^{2} = (4π • R^{3})/(G•M)

* ** Kepler's Third Law*

- 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

**Related Astro Calculators:**

- Hubble's Law
- Kepler's 3
^{rd}Law Calc has Kepler's 3^{rd}law solved for each parameter. - Astronomy Calculator contains basic formulas for a college level Introduction to Astronomy
- Exoplanet Calculator contains formulas for studying planets outside of our Solar System.
- Orbital Radial Acceleration
- Distance to Barycenter
- Sakuma-Hattori Equation
- Astronomical Distance Calculator provides the distance from the Earth to numerous astronomical bodies (e.g. Sun, Moon, planets, stars, Milky Way's Center and Edge, Andromeda Galaxy)
- Astronomical Distance Travel Time Calculator computes the time to travel to distant parts of space at different velocities.
- Ellipse Calculator
- 3D Vector Calculator:
- Drake Equation Calculator
- Seager Equation Calculator
- Friedman Equation Calculator

Special thanks to Dr. Stephen Spicklemire, Department Chair, Physics &Earth-Space Science, Associate Professor of Physics at the University of Indianapolis. Dr. Spicklemire created this calculator and all of the underlying equations (functions) to help his astronomy students.

"vCalc is **awesome** for my astronomy students. With vCalc I can give them real problems that would normally require fairly sophisticated reasoning **and** mathematics, and now they can **do** the reasoning, because they’re not daunted by the math. It’s great." Dr. Steve Spicklemire