Sunspot data for 21 March 2025 of period 2025Q1: (PREV DAY - NEXT DAY)

Sun250321_1507UTC_sketch.jpgSun250321_1511UTC.jpg





Click here for the sharpened image.
Today we had hazy skies. Transparency was poor, but the scintillation monitor reported very good seeing on average. I made the following observation: 
Observation date/time:   21 March 2025 15:07 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 (343mm distance, 80mm diameter)
Reference:               Earth's rotation axis
Exposure (transparency): 1.530ms (using 82nm bandwidth green filter)
Seeing (SSSMon):         1.7-2.0" (1.1" at best)

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Total number of sunspots:  21

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