Comet Tsuchinshan-ATLAS (Comet A3), with an 80,000-year orbit, will be visible from Earth in two periods: from Sept. 27 to Oct. 2 and again in mid-October if it survives its close approach to the sun. It may appear as a fuzzy ball with a tail, visible to the naked eye or with binoculars. The comet’s behavior is unpredictable, with potential changes in brightness and tail development.