The Lyon sisters disappeared on a Tuesday (3/25/75) A full moon occurred on 3/27/75. So their disappearance happened two days before the full moon. In 1975 there were no solar or lunar eclipses in March. In both May and November of 1975 there was a partial solar eclipse and a total lunar eclipse. Not sure if any of this plays into Sheila and Katherine's disappearance. Maybe we can use this thread to list any other murders, abductions that took place on a Tuesday or two days prior to a full moon.