Thursday, December 4, 2025

Cold Moon, active sun

The full moon of December is traditionally called the "Cold Moon".  An appropriate nickname - the temperature is already in the single-digits Fahrenheit two hours before midnight.  This year it is also a perigean full moon (aka "super moon"), so it is noticeably brighter than average.

Cold Moon rising over Snowshoe Mountain, 04 December.


Cold Moon illumination.  Laowa 7.5mm f/2 lens, 2-hr live composite.

A large sunspot group is traversing the sun.  

 
White light. AT80EDT refractor + Lunt solar wedge.

Hydrogen-Alpha light.  Lunt LS50THa with double-stacked etalons.

Even though it is winter, heat currents in the air make it difficult to get sharp single images of the sun during the middle of the day.

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