Some fun: from 13 measurments on the raw images we get 1244.23 pixels as the Sun’s diamater. The pixel size is 4.06μm in this sensor so the size of the Sun’s image on the sensor is 5051.57μm (5.052mm). The focal length of telescope is 550mm. The Sun was 151,801,908km away when this image was taken. To get the diamater of the Sun: 5.052mm x 151,801,908km / 550mm = 1,394,369km (which is only 1% off of the best available measurements).

May 28, 2022

June 5, 2021

Dry run for the 10th of June partial solar eclipse.

The “small” spot in the lower right corner is about 14 pixels in the picture which means in reality it is 15,688km, or, slightly larger than the Earth’s diameter (12,742km). Not so small :-o