This clip is taken from a memorial video NASA posted in memory of Astronaut John Young at the time of his death in 2018. The original lunar footage was taken with a 16 mm movie camera running (probably) at 24 fps. For the memorial, that film was cleaned up and processed to run at 60 fps, so there are a lot of duplicate frames. If the frame advance in Sigmund is set to 5 or 6 frames, the duplicates will not be a problem and your students will get reasonable results. When Astronaut Yong is standing upright, it is 1.85 m from the sole of his shoes to the top of the big pack he's wearing. In analyzing this video, it is really helpful to use the "Hide points" option in Sigmund.