Sunspot data for 17 March 2026 of period 2026Q1: (PREV DAY - NEXT DAY)

Sun260317_1156UTC_sketch.jpgSun260317_1158UTC.jpg





Click here for the sharpened image.
today we had about 30% cumuli, topped with 80% cirrus. Transparency in between was very good, and the scintillation monitor reported very good seeing on average. I made the following observation: 
Observation date/time:   17 March 2026 11:56 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): 0.430ms (using 82nm bandwidth green filter)
Seeing (SSSMon):         1.7-1.8" (1.0" at best)

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Total number of sunspots:  17

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