I read somewhere about fifty years ago that you can tell the exact moment of dawn by holding a white thread at arms length and when you're able to distinguish whether the thread is black or white, it's dawn. I've always intended to try that sometime. But I've never been able to make it a priority enough to remember to do it. Can't think of a single reason, that time of the morning, to want to know the exact moment of dawn.
You can get a fair bead on when it is because of all the night critters tucking themselves in and yawning, and all the day critters walking around yawning and wiping the sleep from their eyes. Makes it a good time for the cats, because nothing's as alert as it might be, except felines.
Occasionally one of the closeby people will see a pair of coyotes run between our houses on their way to a lair in that pile of wood in the thicket yonder about this time, but after they've killed a few pets bunched up too closely together in time, things tend to get too hot for them to be showing themselves for a while.
But I see I'm rambling .... I was planning to offer up a few observations about those MM numbers last night, but I think I'd best put on some coffee, instead, and go out front for another smoke while I wait for it to burble.