The Eclipse, the Eclipse!!

[Anomalocaris]

It appears to me this would occur right on the edge of totality, you should see almost a half circle of bailey's beads right through the entire totality.

But if you're on the very edge of totality, your "entire eclipse" would be momentary, wouldn't it?  It's not like you would get minutes of half-of-the-moon Bailey's Beads, you'd only get them for the few moments that the moon just covers the sun.

I was so so so happy I got to see the Bailey's Beads as totality was ending.  I wanted to see it at the beginning, too, but I was wearing my eclipse glasses so I missed it...  Most beautiful thing I've ever seen.  That and totality itself, but dayum Bailey's Beads...

The bailey beads happen when the limb of the sun stick out from behind the edge of the moon by an amount less than the the height of the topographic variations on the limb of the moon.   Let's say the average topographic variation on the edge of the visible lunar disk is 2kms.   The moon sweeps around the earth at an average speed of 1.02km/s.   So bailey beads phenomenon at the leading and trailing edges of the lunar will last around 2 seconds each, max.

However, on the top and bottom edges of the lunar disk, the motion of the moon is orthogonal to the height of lunar topography.   So bailey beads can last much longer.   The closer you are to the edge of the totality track, the more bailey beads will manifest themselves closer to the top and bottom of the lunar disk rather than the leading and trailing edges of the lunar disk.

Also, keep in mind that although the moon is tidally locked and more or less keep the same face to the earth, the orbit of the moon around the earth has not yet been circularized. That is why sometimes there is annular eclipse, sometimes total eclipse. But it also means the rate of lunar rotation is not exactly the same as the rate of lunar revolution at every part of the lunar orbit. When viewed from the earth, the moon does not keep exactly the same face to the earth during the entire month. Instead the moon disk appears to be shaking its head and nodding with each revolution abouthe earth. So during each eclipse, we are not seeing exactly the same topographic features on the limb of the lunar disk. This means during some eclipse, the edge of the lunar disk might be more jagged, and thus more conducive to making bailey beads, than others.