Oleg Zabluda's blog
Wednesday, August 01, 2018
 
io9: Here's What Earth's Shadow Actually Looks Like.
io9: Here's What Earth's Shadow Actually Looks Like.
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Australian amateur astronomer Tom Harradine had always wanted to create an image of the Earth’s umbra, the darkest inner region of the shadow. But during an eclipse, the Moon doesn’t pass through the whole of the Earth’s shadow. He needed a trick in order to show the whole thing.

“One way, I thought, to get the full circle of the umbra from a single eclipse event is to artificially locate and rotate successive eclipse images so as the shadow boundary forms a circle,” he said. “The trick is to keep the curvature of the shadow matching up as precisely as possible. Which images to choose is up to artistic license and I chose a spiral effect, not only to show the umbra but to also show the progression of the eclipse as time went on.”

The result was this image, the combination of some photo arranging and special camera tricks: keeping the camera’s exposure, ISO, and f-stop settings the same for all but the first three frames of the eclipse (the brightest ones) in order to focus on the shadow, not the Moon. He used his image to correctly calculate the width of the Earth’s umbra at the Moon’s distance, approximately 9,000 kilometers
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https://gizmodo.com/heres-what-earths-shadow-actually-looks-like-1828021990
https://gizmodo.com/heres-what-earths-shadow-actually-looks-like-1828021990

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