Sunspot data for 9 April 2025 of period 2025Q2: (PREV DAY - NEXT DAY)
| Sun250409_1350UTC_sketch.jpg | Sun250409_1353UTC.jpg |
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 |  Click here for the sharpened image. |
Today we had 90% cumuli. Transparency in between was excellent, but the scintillation monitor reported poor seeing on average. I made the following observation:
Observation date/time: 09 April 2025 13:50 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 (343mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.380ms (using 82nm bandwidth green filter) Seeing (SSSMon): 5.0-5.5" (3.5" at best) =================================================================== Total number of sunspots: 30 | |
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