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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Driveway Analemma

Explanation: Does the Sun return to the same spot on the sky every day? No. A more visual answer is an analemma , a composite of sky images taken at the same time and from the same place over a year. At completion, you can see that the Sun makes a f i g u r e 8 on the sky. The featured unusual analemma does not, however, picture the Sun directly: it was created by looking in the opposite direction . All that was required was noting where the shadow of an edge of a house was in the driveway every clear day at the same time. Starting in March in Falcon , Colorado , USA , the photographer methodically marked the shadow's 1 pm location. In one frame you can even see the photographer himself. Although this analemma will be completed in 2025, you can start drawing your own driveway analemma -- using no fancy equipment -- as soon as today.

Date December 4, 2024
Credit Video Credit & Copyright: Nick Wright
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.