Sunspot data for 17 May 2021 of period 2021Q2: (PREV DAY - NEXT DAY)
| Sun210517_1042UTC_sketch.jpg | Sun210517_1048UTC.jpg |
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This morning we had stratus and 90% cumuli, but a small clearance was large enough to make the following observation:
Observation date/time: 17 May 2021 @ 10:42 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 (350mm distance, 80mm diameter) Reference: Earth's rotation axis =================================================================== Total number of sunspots: 1 | |
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