Montana Public Radio

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'Field Notes:' How 'Moon Dogs' Are Made

Dec 29, 2020
A lunar halo, or moon dog. Ruka, Finland
Timo Newton-Syms (CC-BY-SA-2)

Moon dogs have many names: lunar halos, moon rings, or winter rings. Their scientific name is “paraselenae” and they are made visible by a combination of specific circumstances.