Sunspot data for 18 August 2025 of period 2025Q3: (PREV DAY - NEXT DAY)
| Sun250818_1445UTC_sketch.jpg | Sun250818_1452UTC.jpg |
|---|---|
 |  Click here for the sharpened image. |
Today started out grey, but in the afternoon it cleared to about 20%. Transparency in between was good, but the scintillation monitor reported very poor seeing on average. I made the following observation:
Observation date/time: 18 August 2025 14:45 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): 6.0-7.5" (5.0" at best) =================================================================== Total number of sunspots: 4 | |
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