If official night in South Africa starts at 16:45 UTC, the local time of sunset is…
In aviation, “Official Night” typically begins at the end of evening civil twilight.
The duration of twilight, and thus the start of “Official Night”, is highly dependent on both your latitude and the season. The 30-minute rule used is a standard "rule of thumb" for middle latitudes, but the actual time the sun takes to reach 6° below the horizon (the end of civil twilight) varies significantly.
In South Africa, “Official Night” is defined as the period starting 15 minutes after sunset and ending 15 minutes before sunrise.
If “Oficial Night” starts at 16:45 UTC, subtract the 15-minute buffer to find the time the sun actually crosses the horizon:
- 16:45 UTC - 15 minutes = 16:30 UTC
The local time (standard time) of sunset in South Africa (LMT/SAST) will be:
- 16:30 UTC + 2 hours = 18:30
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