Sunspot data for 12 October 2025 of period 2025Q4: (PREV DAY - NEXT DAY)
| Sun251012_1525UTC_sketch.jpg | Sun251012_1550UTC.jpg |
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 |  Click here for the sharpened image. |
today was grey, but shortly before sunset two small clearance allowed observations. Transparency in between was poor, and the scintillation monitor could not report seeing, but visually it was good. I made the following observation:
Observation date/time: 12 October 2025 15:25 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): 0.830ms (using 82nm bandwidth green filter) Seeing (SSSMon): not measured, but good =================================================================== Total number of sunspots: 36 | |
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