Sunspot data for 20 April 2021 of period 2021Q2: (PREV DAY - NEXT DAY)
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today we had a lovely morning, though with 20% cumuli and varying seeing, but generally quite good. I made the following observation:
Observation date/time: 20 April 2021 @ 09:55 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 (340mm distance, 80mm diameter)
Reference: Earth's rotation axis
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Number of groups: 3
Group 1:
Number of sunspots: 5
Group 2:
Number of sunspots: 4
Group 3:
Number of sunspots: 1
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Total number of sunspots: 10
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