frudawski

sunset

The sunset function determines the UTC (Coordinated Universal Time) when the sun just sets below 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] = sunset(day,coord)

Where:

ParameterDescription
utcReturns the UTC time in 'hh:mm:ss' format.
lctReturns the local time, offset to UTC is defined in LT_location.mat file.
daySpecifies the date in ‘DD.MM.YYYY’ format.
coordSpecifies the geographic coordinates, default is defined in LT_location.mat file, default Berlin: [13.326 52.514].

Examples

Determine UTC for sunset at 13.05.2020 in Berlin:

utc = sunset('13.05.2020')

Result:

utc = 18:52:07

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

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

Result:

utc = 18:52:07
lct = 20:52:07

Determine UTC for sunset at 21.04.1988 in Athens:

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

Result:

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

Reference

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

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