The amateur astronomy magazine "Astronomy" had an article in the March, 1995,
issue which stated that fossil corals shows that 370 million years ago, the year
had 400 days that were 22 hours long. In the Ordovician period fossil
nautiloids show evidence for a 10 day lunar month with a 21 hour day and a 417
day year. Does anyone know of any other published studies of evidence of
astronomical phenomena found in the fossil record?
RWS