1.2 The Gnomon
A gnomon is a simple stick planted vertically into the ground.
The direction and length of its shadow depends on the position of the Sun. Already in use for 3000 years, the gnomon despite its simplicity, has enabled astronomers since ancient times to solve difficult problems such as the division of the day into equal periods, the measurement of the cycle of the seasons and the establishment of the first calendars.
Put a small stone at the end of the shadow and come back in a few minutes.
What do you notice?