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Skywarden,
Ursa Astronomical Association
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00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Moon - 20.9.2021 at 20.23 Sodankylä, Ukko-Luosto Observation number 101570

Visibility IV / V


#Baskeripäinen moon

A lower, just rising moon often shows this kind of "beret" on his head. To my recollection, I have never seen such a phenomenon at such a high level before. Is it a question of the surface version of the lower atmosphere cooled by the radiant cooling of the earth's surface, which causes weaving on the top of the moon? In the images taken some time later, the phenomenon had disappeared. The image is stacked from five exposure bracketed images.


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  • Observation target
    • Moon
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