I tried this with a solar transit last year and discovered that my expensive phone can't keep time. Learned my lesson - for this lunar transit I shot video a few minutes before and after. The video is 4K and has the unedited 1 second transit and a zoomed in slow version where you can actually see the thing. Unfortunately this means the composite at the top is made from frames extracted using ffmpeg. Next time, two cameras, so I can attempt a burst as well as a video.
Shot on a Sony RX10 IV from San Francisco.