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# Astronomy

Astronomy is the scientific study of matter, gravity and light and celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae). These objects are outside the earth's atmosphere and astronomy includes the study of their physical and chemical properties .

Sub-fields of astronomy include: Solar astronomy, Planetary science, Stellar astronomy, Galactic astronomy, Extragalactic astronomy, and Cosmology.

vCalc's Astronomy library contains equations and constants used to study these celestial objects.

### Parent Categories:

## Subcategories

## Astronomy Calculators

## Astronomy Collections

## Astronomy Equations

- Angular Frequency from Period
- Astro Distances
- Astro Travel Time
- Astronomical Distance Conversions
- barycenter distance (r1)
- Force of Gravity
- Full Impulse Speed
- lux - to - vMag
- Speed of Circular Motion
- Sphere - Volume
- Sphere - Volume from Circumference
- vMag - to - lux
- Absorbance
- Age of Universe (estimated)
- Albedo (absolute magnitude and diameter)
- Blackbody Temperature from peak wavelength
- Blackbody wavelength from Temperature
- Difference in magnitudes from Flux Ratio
- Distance from absolute and apparent magnitude
- Distance Light Traveled
- Drake Equation (original)
- Flux Ratio from Magnitudes
- Gregorian Calendar to Julian Day Number (JDN)
- Hubble Law
- J2 Perturbation Acceleration
- K3L-Mass from Period and Separation
- K3L-Period from Mass and Separation
- 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
- Modified Julian Day (MJD)
- `sqrt( (G*M)/R )`
- radius from speed and period
- Reduced Julian Day (RJD)
- 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
- Schwarzchild Radius
- Seager Equation
- speed from delta lambda and lambda
- Stephan-Boltzmann Law
- Truncated Julian Day (TJD)
- Unix Time (seconds)
- Warp Speed
- Wavelength shift from speed and wavelength