Baron Rutledge, a surveyor, measured reciprocal zenith angles and posted a video of the process along with the field notes. The video and field notes are below. The plumb lines deviated 15.2 arcseconds over a distance of 1158 feet. This confirms the earth is convex and falsifies the hypothesis that the earth is flat.

I entered his data into a spreadsheet.

Original video on TikTok: https://www.tiktok.com/@arizonalandsurveyor/video/7259464156795997483