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...I'm mostly a nighttime observer, but Comet Tsuchinshan-ATLAS (C/2023 A3) has turned my schedule upside down. For the past 10 days, I've been up at dawn, peering through the horizon murk for brief views of the comet, then sticking around for an extra hour to see sunup. In that time I've met a whole new group of people -- runners, birders and of course, sunrise-watchers.

From the northern U.S., the comet has primarily been a photographic object too faint to see without binoculars. But those in the southern U.S. and southward, where the comet stands higher and suffers less from atmospheric absorption, have seen a bright, strongly condensed coma and a tail more than 15 long. Observers there simply have to look up, and there it is. Even smartphones suffice for capturing the comet with a favorite twilight scene. ...