Sunspot data for 30 September 2025 of period 2025Q3: (PREV DAY - NEXT PERIOD)
| Sun250930_0832UTC_sketch.jpg | Sun250930_0836UTC.jpg |
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 |  Click here for the sharpened image. |
today we had 70% cumuli topped with 80% alto cumulus, but luckily with some large clearances in both layers. Transparency in them was excellent, but the scintillation monitor reported mediocre seeing on average. I made the following observation:
Observation date/time: 30 September 2025 08:32 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 (347mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.430ms (using 82nm bandwidth green filter) Seeing (SSSMon): 3.0-4.0" (2.0" at best) =================================================================== Total number of sunspots: 55 | |
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