Astronomy, astrophysics

Main Index; Physical Sciences; - Circular orbit
*Circular orbit between two massive bodies.* - Earth orbit
*Speed and period at the given satellite height.* - Escape velocity
*Calculated from mass and distance.* - Newton's gravitation law
*Calculation of force and p.e.* - Orbital period of a planet
*Based on Kepler's third law.* - Magnitude and Luminosity
*Star brightness, apparent and absolute.*