Bright representing the path of the Sun for a year.
It is called Analemma and has a figure eight.
Presentation: Individual box with silver closure, leather cord 56 cm and instructive legend.
Theory: The Analemma is the curve that makes the sun for a year.
It has a figure eight and we would have a graphic testimony of this tour if during every day of the year we took a picture of the Sun from the same place at the same time.