What a smart way to get some measurements.
Here’s a related (sort of) sun measurement tidbit. When I was positioning exactly where my greenhouse would be, I wanted to make sure I had it facing due south so as to maximize exposure. I used stakes that were leveled so as to have their shadows perfectly aligned at solar noon. It isn’t 12:00PM but rather exactly halfway between sunrise and sunset which I got from the local paper every day. It took repeated measurements as I kept adjusting day after day until I got the angle just right. Of course half the time clouds would roll in ten minutes before solar noon negating any adjustments that day.