Analemma

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...a trace of the annual movement of the Sun on the sky. Well known among experts of sun-dials and old Earth's globes as a diagram of change of seasons and an equation of time.

The pictures were taken exactly at 5:45 UT of every tenth day. Resulting in the Sun being photographed 36 times. Nobody can guarantee fine weather every tenth day even for a few minutes, photographs were missed on two occasions. (Nov 26th and Jun 20th)