Professional paper

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

Goran Tomac ; University of Zagreb, Faculty of Geodesy, Kaciceva 26, 10000 Zagreb
Drago Špoljarić orcid.org/0000-0001-7427-044X ; University of Zagreb, Faculty of Geodesy, Kaciceva 26, 10000 Zagreb

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 ephemerides; equation of time; true solar time; mean solar time; analemma; zone time; sunrise and sunset; azimuth of sunrise and sunset

Hrčak ID:

162164

URI

https://hrcak.srce.hr/162164

Publication date:

30.12.2015.

Article data in other languages: croatian

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