frudawski

# sunrise

The sunrise function determines the UTC (Coordinated Universal Time) when the sun just rises above the horizon, \gamma = -0,833\degree. The default geographical settings are set in the file “LT_location.mat”. Change the settings to your preferred location and set the file to read-only in order to prevent your settings from being overwritten with the default values in future versions.

Usage:

[utc,lct] = sunrise(day,coord)

Where:

Examples

Determine UTC for sunrise at 13.05.2020 in Berlin:

utc = sunrise('13.05.2020')

Result:

utc = 03:14:01

Determine UTC and local time for sunrise at 21.07.2025 in Berlin:

[utc,lct] = sunrise('13.05.2020')

Result:

utc = 03:14:01
lct = 05:14:01

Determine UTC for sunrise at 21.04.1988 in Athens:

utc = sunrise('21.04.1988',[37.978 23.728])

Result:

utc = 03:01:36

Reference

DIN EN 17037:2019-03: Daylight in buildings. 2019.