A rare naked-eye eclipse of the bright star Regulus by the Moon occurred on Friday night, May 21st-22nd. It was seen from nearly all of the U.S.A., Canada, and much of Mexico (except where weather interfered). Astronomers call such eclipses "occultations". Accurately timed records are valuable for helping chart lunar mountains and craters, and creating data that is needed for analyzing timed observations of total solar eclipses. Those observations can then be used to measure small variations in the solar diameter (and its energy output) that could enhance our knowledge of climate phenomena such as global warming. The objective was to record the exact moment of the star's disappearance at the advancing dark edge of the Moon, and the exact time of its reappearance on the other side. More information on occultations can be found at the web site of the International Occultation Timing Association (IOTA) at http://www.lunar-occultations.com/iota/iotandx.htm.
Observed with a video camera attached to an Astrophysics 130 EDT.
Timing was recorded from WWV at 10MHz.
Displayed clock is PDT and is synchronized to WWV
Here are some images of the reappearance: