Describe: This program calculates sunrise, sunset and twilight times as well as time of the local noon, azimuth of sunset and sunrise, and sun elevation at noon. Calculations are done in local time of the selected site. This program is not intended for astronomers. Calculations are based on a quite sophisticated model and have absolutely professional astronomical precision, but displayed results do not present values that are important to people working in the field of astronomy. Very fast download suncalc 11 help desk.