netstandard2.0 true true CosineKitty.AstronomyEngine 2.1.19 https://github.com/cosinekitty/astronomy Don Cross Copyright (c) 2019-2022 Don Cross <cosinekitty@gmail.com> MIT Astronomy Engine calculates Sun, Moon, and planet positions. It predicts lunar phases, eclipses, transits, oppositions, conjunctions, equinoxes, solstices, rise/set times, and other events. It provides vector and angular coordinate transforms among equatorial, ecliptic, horizontal, and galactic orientations. - Provides calculations for the Sun, Moon, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. - Calculates all supported objects for any calendar date and time for millennia before or after the present. - Provides heliocentric and geocentric Cartesian vectors of all the above bodies. - Determines apparent horizon-based positions for an observer anywhere on the Earth, given that observer's latitude, longitude, and elevation in meters. Optionally corrects for atmospheric refraction. - Calculates rise, set, and culmination times of Sun, Moon, and planets. - Finds civil, nautical, and astronomical twilight times (dusk and dawn). - Finds date and time of Moon phases: new, first quarter, full, third quarter (or anywhere in between as expressed in degrees of ecliptic longitude). - Predicts lunar and solar eclipses. - Predicts transits of Mercury and Venus. - Predicts lunar apogee and perigee dates, times, and distances. - Predicts date and time of equinoxes and solstices for a given calendar year. - Determines apparent visual magnitudes of all the supported celestial bodies. - Predicts dates of planetary conjunctions, oppositions, and apsides. - Predicts dates of Venus' peak visual magnitude. - Predicts dates of maximum elongation for Mercury and Venus. - Calculates the positions of Jupiter's four largest moons: Io, Europa, Ganymede, and Callisto. - Allows custom simulation of the movements of user-defined small bodies, such as asteroids and comets, through the Solar System. - Converts angular and vector coordinates among the following orientations: Equatorial J2000, Equatorial equator-of-date, Ecliptic J2000, Topocentric Horizontal, Galactic (IAU 1958). - Determines which constellation contains a given point in the sky. - Calculates libration of the Moon. - Calculates axis orientation and rotation angles for the Sun, Moon, and planets.