Astronomical Calendar: Sun and Moon Ephemerides and Twilight Calculator

The Astronomical Calendar is a software package for automated calculations of the celestial coordinates (ephemerides) of the Sun and Moon. It computes the times of sunrise and sunset, the boundaries of civil, nautical, and astronomical twilight, and lunar phases, based on the geographic coordinates of the observing site and its time zone. A web-based implementation is hosted at the Fesenkov Astrophysical Institute and is available in Kazakh, Russian, and English. The service allows users to obtain ephemerides for any location on Earth and export results as tables (including PDF output). The Astronomical Calendar is widely used for planning observations with robotic telescopes and for estimating natural illumination conditions. The web page of the Astronomical Calendar is available at: https://fai.kz/calendar/calendar_eng.php
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