Sunspot data for 27 February 2025 of period 2025Q1: (PREV DAY - NEXT DAY)
| Sun250227_1219UTC_sketch.jpg | Sun250227_1221UTC.jpg |
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 |  Click here for the sharpened image. |
Today was mainly grey, but around noon we had some small clearance, although with a hazy sky. Transparency was mediocre, but the scintillation monitor reported reasonable seeing on average. I made the following observation:
Observation date/time: 27 February 2025 12:19 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 (342mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.630ms (using 82nm bandwidth green filter) Seeing (SSSMon): 2.5-3.0" (2.0" at best) =================================================================== Total number of sunspots: 21 | |
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