The moon, coral growth, and how many days used to be in a year - Indiana Public Media

Growth rings in corals reveal some interesting insights into how many days were in a year millions of years ago.

D: Yaël, do you notice the days changing length over the course of the year? Y: Sure, Don, it stays light later in the summer and gets dark earlier in the winter. D: No, that's not it. I mean the w… [+1194 chars]

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