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# Astronomy Calc

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*

#### Astronomy Calculators

- 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:**

- 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.
- 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

### Astronomy Calculator's Creator

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

**Astronomy Calc**, references 30 equations/constants.

**Equations and Constants **

- G (Gravitational Constant) : metric
- Speed of Circular Motion
- Blackbody Temperature from peak wavelength
- Blackbody wavelength from Temperature
- Difference in magnitudes from Flux Ratio
- Distance from absolute and apparent magnitude
- Flux Ratio from Magnitudes
- Hubble Time
- K3L-Mass from Period and Separation
- K3L-Period from Mass and Separation
- K3L-Separation from Mass and Period
- Luminosity from Mass
- Magnification of a Telescope
- Mass from Acceleration and Radius
- Mass from Luminosity
- Mass from Speed and Separation
- mass of extra-solar planet from M, r and R
- mass of extra-solar-planet from M, v and V
- Photon Energy from Wavelength
- Photon Wavelength from Energy
- radius from speed and period
- Relative Luminosity from relative size and temperature
- Relative Size from Relative Temperature and Luminosity
- Relative Temperature from Relative size and luminosity
- Resolving Power of a Telescope
- SAF Distance from Size and Angle
- SAF-Angle from size and distance
- SAF-Size from Distance and angle
- speed from delta lambda and lambda
- Wavelength shift from speed and wavelength
- more...