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Online Ephemerides – the Equation of Time and True Solar Time, Sunrise and Sunset and the Corresponding Azimuths

Goran Tomac, Drago Špoljarić

Abstract


The paper describes the Croatian web page Online ephemerides with its applications for calculating and visualising the equation of time and the analemma, converting zone time (zone or civil time) into true solar time (the time shown by sundials) and calculating the time of sunrise and sunset and the corresponding azimuths. The calculated values for the equation of time, ephemeris transit and the true solar time of ±4 seconds, sunrise and sunset times of ±30 seconds and the azimuth of ±30” must meet the accuracy needed by both amateur and professional astronomers. The web applications described are also adapted for smart phones.

Keywords


online efemeride, jednadžba vremena, pravo Sunčevo vrijeme, srednje Sunčevo vrijeme, analema; pojasno (zonsko) vrijeme; izlazak i zalazak Sunca; azimut izlaska i zalaska Sunca

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Copyright (c) 2015 Goran Tomac, Drago Špoljarić

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