Sunspot data for 30 December 2025 of period 2025Q4: (PREV DAY - NEXT DAY)

Sun251230_1007UTC_sketch.jpgSun251230_1009UTC.jpg





Click here for the sharpened image.
today we had patches of dense cumuli with large clearances in between. Transparency was mediocre, and the scintillation monitor reported mediocre seeing on average. I made the following observation: 
Observation date/time:   30 December 2025 10:07 UTC
Telescope:               GTT60 (Galileo Type Telescope)
Focal length:            1490mm (plano convex singlet)
Aperture:                60mm
Stop:                    30mm
Eyepiece:                -75mm (plano concave singlet, 24mm aperture)
Observation type:        projection (338mm distance, 80mm diameter)
Reference:               Earth's rotation axis
Exposure (transparency): 0.680ms (using 82nm bandwidth green filter)
Seeing (SSSMon):         3.5-4.0" (2.0" at best)

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Total number of sunspots:  30

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