Funktional principle
Time
Date
Sub-solar point
True noon
Unique
Meridian crossing of the sun
When the sun traverses
the meridian, the moment
of true noon occurs. The sun
is exactly in the south and has
reached its highest position for the
day. The location of the luminous point
at this moment, and all other locations
at this longitude, are experiencing real
midday. In navigation, this is the ideal
moment for taking one's bearings.
