April 22-23 is the peak of the Lyrid meteor shower, one of the oldest displays known, with observations dating back 2,600 years. Active from April 19 through the 24th, this display usually produces about a dozen swift meteors per hour under ideal conditions, caused by dust particles from Comet Thatcher burning up as they enter the atmosphere at high speed. The shower's name comes from how the meteors appear to radiate from the vicinity of the constellation Lyra the Harp, which rises around 10 pm. Fortunately, at the shower's peak, the Moon will be a waning crescent that rises shortly before dawn, and its light shouldn't interfere. While the Lyrids are normally a modest display, unexplained outbursts of more than 100 per hour were observed in 1922, 1945, and 1982.