File:Penumbral lunar eclipses on 2016 and 2020 comparison (49695754167).jpg

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Only now have I realized that the last two penumbral eclipses, in September 2016 and last January, occurred with a very similar, almost identical libration. The difference consists only in the position referred to the earth's shadow, that is to say almost opposite. This circumstance allows us to estimate the effect of the atmosphere during a penumbral phase.

2016: TecnoSky triplet refractor APO70mm FPL-53 + KodakC183

2020: Apo refractor ED 127mm f/9 + Canon EOS 4000D
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Source Penumbral lunar eclipses on 2016 and 2020 comparison
Author Giuseppe Donatiello from Oria (Brindisi), Italy

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This image was originally posted to Flickr by gjdonatiello at https://flickr.com/photos/133259498@N05/49695754167. It was reviewed on 11 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

11 May 2021

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