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# Astronomy

Astronomy is the scientific study of matter and objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae), outside the earth's atmosphere and 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

- Astro Distances
- Astro Travel Time
- barycenter distance (r1)
- 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)
- Drake Equation (original)
- Gregorian Calendar to Julian Day Number (JDN)
- K3L-Mass from Period and Separation
- K3L-Period from Mass and Separation
- K3L-Separation from Mass and Period
- Mass from Acceleration and Radius
- 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 )`
- Reduced Julian Day (RJD)
- Schwarzchild Radius
- Seager Equation
- speed from delta lambda and lambda
- Truncated Julian Day (TJD)
- Unix Time (seconds)
- Warp Speed
- What's Your Dog's Sign?
- What's Your Sign?