Error number 4001 in 4: Error while evaluating velocity template htmlheader.vm
Back to Directory


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 .Small Angle Formula.png

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:


Astronomy Calculators

Astronomy Collections

Astronomy Equations

  • Acceleration Due to Gravity by vCalc
  • Angular Frequency from Period by vCalc
  • Astro Distances by vCalc
  • Astro Travel Time by vCalc
  • Astronomical Distance Conversions by vCalc
  • barycenter distance (r1) by vCalc
  • Escape Velocity by vCalc
  • Force of Gravity by vCalc
  • Full Impulse Speed by vCalc
  • Kilometer to Light-years by vCalc
  • Kilometers to Kilo-light-years by vCalc
  • Kilometers to Light-days by vCalc
  • Kilometers to Light-hours by vCalc
  • Kilometers to Light-minutes by vCalc
  • Kilometers to Light-seconds by vCalc
  • Kilometers to Mega-parsecs by vCalc
  • Kilometers to Parsecs by vCalc
  • Light-years to Kilometers by vCalc
  • lux - to - vMag by vCalc
  • Martian Weight by vCalc
  • Potential Energy of Gravity by vCalc
  • Speed of Circular Motion by vCalc
  • Sphere - Radius from Volume by vCalc
  • Sphere - Volume by vCalc
  • Sphere - Volume from Circumference by vCalc
  • Standard Gravitational Parameter by vCalc
  • vMag - to - lux by vCalc
  • Absorbance by MichaelBartmess
  • Age of Universe (estimated) by MichaelBartmess
  • Apsis-Apocenter (maximum distance) by EmilyB
  • Apsis-Apocenter (minimum speed) by EmilyB
  • Astronomical Albedo by EmilyB
  • Blackbody Temperature from peak wavelength by sspickle
  • Blackbody wavelength from Temperature by sspickle
  • Difference in magnitudes from Flux Ratio by sspickle
  • Distance from absolute and apparent magnitude by sspickle
  • Distance Light Traveled by KurtHeckman
  • Drake Equation (original) by MichaelBartmess
  • Escape Velocity (Using Density) by Billy
  • Flux Ratio by KurtHeckman
  • Flux Ratio from Magnitudes by sspickle
  • Force of Sun's gravity on planets by MichaelBartmess
  • Friedman Equation by MFriedmanMD
  • Gregorian Calendar to Julian Day Number (JDN) by MichaelBartmess
  • Hill Sphere Radius by KurtHeckman
  • Hubble Law by sspickle
  • J2 Perturbation Acceleration by eng
  • K3L-Mass from Period and Separation by sspickle
  • K3L-Period from Mass and Separation by sspickle
  • Lens Maker's Equation (solved for `f`) by TylerJones
  • Lens Maker's Equation (solved for `n_"lens"`) by TylerJones
  • Lens Maker's Equation (solved for `n_"medium"`) by TylerJones
  • Lens Maker's Equation (solved for `r_1`) by TylerJones
  • Lens Maker's Equation (solved for `r_2`) by TylerJones
  • Light-seconds to Kilometers by KurtHeckman
  • Luminosity from Mass by sspickle
  • Magnification of a Telescope by sspickle
  • Mass from Acceleration and Radius by sspickle
  • Mass from Luminosity by sspickle
  • Mass from Speed and Separation by sspickle
  • mass of extra-solar planet from M, r and R by sspickle
  • mass of extra-solar-planet from M, v and V by sspickle
  • Modified Julian Day (MJD) by MichaelBartmess
  • `sqrt( (G*M)/R )` by Carol
  • Photon energy by ekskekel
  • Photon Energy from Wavelength by sspickle
  • Photon Wavelength from Energy by sspickle
  • radius from speed and period by sspickle
  • Reduced Julian Day (RJD) by MichaelBartmess
  • Relative Luminosity from relative size and temperature by sspickle
  • Relative Size from Relative Temperature and Luminosity by sspickle
  • Relative Temperature from Relative size and luminosity by sspickle
  • Resolving Power of a Telescope by sspickle
  • SAF Distance from Size and Angle by sspickle
  • SAF-Angle from size and distance by sspickle
  • SAF-Size from Distance and angle by sspickle
  • Schwarzschild Radius by MichaelBartmess
  • Seager Equation by EmilyB
  • speed from delta lambda and lambda by sspickle
  • Speed of Light by vCollections
  • Sphere - Density by KurtHeckman
  • Stephan-Boltzmann Law by MichaelBartmess
  • Truncated Julian Day (TJD) by MichaelBartmess
  • Unix Time (seconds) by MichaelBartmess
  • Warp Speed by KurtHeckman
  • Wavelength shift from speed and wavelength by sspickle

Astronomy Constants