For many people in the U.S., the total eclipse of April 8, 2024, will be a life-changing event. For me, it was the eclipse of March 7, 1970, on the sand at Virginia Beach with two of my fellow high school teachers, that set my life in a new direction. On that day, the real drama began when the moon was covering about 70% of the sun from view, also known as the 70% phase. I noticed that my shadow on the sand was sharp on the left, but very fuzzy on the right. A few minutes discussion revealed the...