Posted on 12/04/2024 12:52:47 PM PST by MtnClimber
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 figure 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.
Today's imave is a video at the source link
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Today's image is a video at the source link
What Anal Emma?....................
Honestly, I still don't understand it (how the effect happens).
OK, that’s really cool. I have similar structural geometry at home; I might try it.
From a given location on Earth, at a given time of day, the sun does not appear at the same place in the sky each day.
Earth’s axis of rotation is tilted with respect to its orbital plane around the sun. Earth’s orbit is also slightly eccentric. These combine to form the figure-8 pattern of the sun’s position in the sky, or the pattern traced out by the shadow of the roof corner on the driveway.
No, it's Ana Lemma. One of those 19th-century Russian novels.
My grandparents had a globe with an analemma on it. But they didn’t have a driveway.
Great explanation! I would love to try that someday.
If I could mount a camera in a location inside where it wouldn’t get bumped….
I’m currently thinking in terms of putting an ESP32 microcontroller with attached camera on the wall, and having it serve up a picture at the same time of day every day to a web app on my main computer.
Pretty cool idea.
Pinging the APOD list (with the list this time)
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Today’s image is a video at the source link
The rest of the Analemma keyword, sorted:
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