Geochronous clock
The earth map moves almost imperceptibly from left to right, synchronized with the earth's rotation, from west to east, while the time scale at the top is still. The upper scale shows summer time, the lower part of the scale shows winter time. Between the vertical black lines on the right and left, the earth is shown for a period of 24 hours. It is morning on the left half and afternoon on the right half. The time zones are marked with letters. Vertical above the black point near the center of the clock you have to think of the current position of the sun. Due to the different orbital speed of the earth around the sun and the inclination of the earth's axis, this point moves in relation to the center of the earth around the sun during a year apparently on an eight (analemma) In the illuminated part of the map it is day, in the dark part it night. The left edge of the light zone represents the sunrise, the right edge represents the sunset. If you imagine a horizontal line through a place, you can read off the times for sunrise and sunset on the time scale.
