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Astronomy

Planet age and weight, light travel time, moon phase and more.

8 calculators

Light-Year Converter

Convert distances between light-years, parsecs, AU, and kilometres.

Calculate magnification, exit pupil, and limiting magnitude for your telescope.

Calculate current approximate distance to planets and light travel time.

Calculate the current moon phase and days until the next full moon.

Estimate a star's main-sequence lifetime based on its mass.

Calculate the escape velocity from any celestial body.

Calculate the orbital period of any body using Kepler's third law.

Calculate the recession velocity and lookback time from redshift z.