The world map represented on the Geochron makes one complete revolution within 24 hours. The map of the Geochron is newly edited each year by the National Geographic magazine. The middle of the Geochron shows noon and the time of each location on the planet can be checked instantly.

A fascinating aspect of Geochron is that it automatically shows at which point on the earth is day or night. This, of course, automatically changes with the seasons.

As the length of daylight is influenced by the position of the sun and the axis of the earth, this is easily seen on the Geochron analemma.

Winter solstice in the northern hemisphere (see picture at top). On the longest day of the year, the sun is over 23 degrees north and represents the midnight sun over the polar circle.

Equinox (center picture) which occurs on the 21st of June and September is when day and night is equal everywhere on the planet due to the fact that sun is directly over the equator.

Winter solstice (bottom picture) represents the shortest day in the northern hemisphere and the Winter in the southern hemisphere.

Time zones are indicated on the Geochron map in bold letters for each country so that one can immediately see the time anywhere on the planet.

Due to the motion of the map from left to right, the changes and the respective times at each location can be followed continuously by referring to the scale at the top of the Geochron.