Peak: April 21, 1904, around 12:00 UTC — up to about 18 meteors an hour under a dark sky. The Moon will be 32% lit: some moonlight, which will hide the fainter meteors. Meteors seem to come from Lyra; the debris is from Comet Thatcher (C/1861 G1). Among the oldest showers on record: Chinese astronomers saw them in 687 BC. Peak times and rates: the International Meteor Organization's working list.