Sun_projection_with_spotting-scope.jpg |裸Scientists - 188BET竞彩,188金宝慱亚洲体育app

Ocular projection of the sun with large sunspots using a spotting scope (50mm diameter, 45x magnification) and a sheet of paper approx. 30 cm from the ocular. The apparent granulation is due to that of the paper rather than the photospheric...

Credit:

GNU1.2 - SiriusB

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