The partial solar eclipse of October 25, 2022 was tracked from Averbode. With some clouds, the conditions were less good than last year on June 10, 2021, but still sufficient.The solar eclipse was tracked with a TLAPO80/480 f/6 and Nikon D7500. A solar filter ND3.8 and OIII filter were used.
A total of 127 photos were taken represesnting 3.56Gb of data. Several photos were edited and one timelapse of the process was created. You can visit my blog for this see this link .
I tried to determine the maximum of the solar eclipse as well as the time of the maximum. ImageJ software was used. To determine the surface of the sun, raw photos were uploaded and after selection via color contrast, the number of pixels that which are not obscured are calculated. The “solidity” was also calculated. This is the result of dividing the area of the eclipse by the convex area (smallest perimeter of a surface). To calibrate the time with my Nion D7500 photos, I used the time via the Frankfurt atomic clock.
I have shown in the top right corner the data for Averbode as obtained from www.timeanddate.com
Conclusion: the solidity gives much lower coverage values than the pixel values. The traject of the eclipse and the calculations are influenced by the clouds on the photos. The time of the maximum is 2 minutes earlier than indicated on the website. The coverage value is 2% points higher than indicated on the website.
A fun exercise that mainly shows the power of the ImageJ program.
