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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

- Acceleration Due to Gravity
- Angular Frequency from Period
- Astro Distances
- Astro Travel Time
- Astronomical Distance Conversions
- barycenter distance (r1)
- Escape Velocity
- Force of Gravity
- Full Impulse Speed
- Kilometer to Light-years
- Kilometers to Kilo-light-years
- Kilometers to Light-days
- Kilometers to Light-hours
- Kilometers to Light-minutes
- Kilometers to Light-seconds
- Kilometers to Mega-parsecs
- Kilometers to Parsecs
- Light-years to Kilometers
- lux - to - vMag
- Martian Weight
- Potential Energy of Gravity
- Speed of Circular Motion
- Sphere - Radius from Volume
- Sphere - Volume
- Sphere - Volume from Circumference
- Standard Gravitational Parameter
- vMag - to - lux
- Absorbance
- Age of Universe (estimated)
- Apsis-Apocenter (maximum distance)
- Apsis-Apocenter (minimum speed)
- Astronomical Albedo
- 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)
- Escape Velocity (Using Density)
- Flux Ratio
- Flux Ratio from Magnitudes
- Force of Sun's gravity on planets
- Friedman Equation
- Gregorian Calendar to Julian Day Number (JDN)
- Hill Sphere Radius
- Hubble Law
- J2 Perturbation Acceleration
- K3L-Mass from Period and Separation
- K3L-Period from Mass and Separation
- Lens Maker's Equation (solved for `f`)
- Lens Maker's Equation (solved for `n_"lens"`)
- Lens Maker's Equation (solved for `n_"medium"`)
- Lens Maker's Equation (solved for `r_1`)
- Lens Maker's Equation (solved for `r_2`)
- Light-seconds to Kilometers
- 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 )`
- Photon energy
- Photon Energy from Wavelength
- Photon Wavelength from Energy
- 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
- Schwarzschild Radius
- Seager Equation
- speed from delta lambda and lambda
- Speed of Light
- Sphere - Density
- Stephan-Boltzmann Law
- Truncated Julian Day (TJD)
- Unix Time (seconds)
- Warp Speed
- Wavelength shift from speed and wavelength

## Astronomy Constants

- `9.8 m/s^2`
- astronomical unit (km)
- Kilo-Light Year
- Light Day
- Light Hour
- Light Minute
- Light Second
- Light Year
- Mega-Parsec
- Parsec
- Planck constant (J*s)
- Synodic month
- (muD) Sun
- Age of Universe (estimate)
- astronimical unit (m)
- Density of the Universe
- Earth orbit inclination to invariable plane
- g_(Earth)
- g_(Jupiter)
- g_(Mars)
- g_(Mercury)
- g_(moon)
- g_(Neptune)
- g_(Pluto)
- g_(Saturn)
- g_(Sun)
- g_(Uranus)
- g_(Venus)
- g_(Vesta)
- Hubble constant (with units)
- Temperature of the Universe