Sunspot data for 21 July 2025 of period 2025Q3: (PREV DAY - NEXT DAY)
| Sun250721_0752UTC_sketch.jpg | Sun250721_0754UTC.jpg |
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 |  Click here for the sharpened image. |
Today started out with clear skies, but soon cumuli started to develop, during observation it was about 10% coverage. Transparency in between was excellent, and the scintillation monitor reported good seeing on average. I made the following observation:
Observation date/time: 21 July 2025 07:52 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 Exposure (transparency): 0.380ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.0-3.0" (1.2" at best) =================================================================== Total number of sunspots: 22 | |
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