This page enables you to know when several kind of nights begin
- Sunrise / Sunset : we do not take into account any hill or
mountain which can hide the sun.
- Aeronautical night : the night which interests VFR pilots.
Sun at 6° under the horizon. It is also the moment when it
becomes impossible to drive whithout one's headlights.
- Nautical night : the sailors'night, when it becomes impossible to see any difference
between the sea and the sky.
- Astronautical night : for astronomers, the moment when the
darkness becomes total...unless the moon shines.