AstronautiCalc

AstronautiCalc is a scientific calculator built for people who work with orbits. Enter an altitude or radius and it computes the orbital parameters that follow: period, semi-major axis, circular and escape velocity, revolutions per day, maximum eclipse duration, apparent Earth angular radius and range to horizon. ORBITAL DYNAMICS J2 nodal precession rate, and the inclination that makes an orbit sun-synchronous. GROUND STATION VISIBILITY Maximum time in view and slant range, tabulated at 0, 5, 10, 15 and 20 degrees elevation, so you can size a pass without reaching for a spreadsheet. DELTA-V Plane change per degree, and the burn required to lower perigee for de-orbit. IT SHOWS ITS WORKING Key quantities carry a help entry giving the formula behind them and stating the assumptions made, including the circular-orbit simplification. SCIENTIFIC CALCULATOR A full scientific keypad with…