This is debris from Comet Halley, the most famous of all short-period comets. Dawn this morning was actually the best time to look, but it’s a fairly drawn-out shower, so tomorrow morning should be worth a look-see as well, if your weather is cooperating — though bear in mind that it’s not one of the heavier showers. You might see a handful in a hour, or 25 if you’re very lucky and in a very nice dark sky location. The radiant point of this shower is in the constellation Orion, which is one of the easiest to recognize in the night sky. If you are looking at Orion, and his belt is in the middle with Betelgeuse (the reddish one) to the upper left, the radiant will be up and to the left of there.