Sunspot data for 23 September 2021 of period 2021Q3: (PREV DAY - NEXT DAY)

Sun210923_1002UTC_sketch.jpgSun210923_1004UTC.jpg


Today we had thin about 95% cumuli with a short clearance at the end of the morning. Transparency was good, seeing mediocre. I made the following observation: 
Observation date/time:   23 September 10:02 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 (351mm distance, 80mm diameter)
Reference:               Earth's rotation axis
Exposure (transparency): 0.180ms
Seeing (SSSMon):         6.0-6.5"

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Total number of sunspots:   11

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