The Past Earth's Rotation

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We have proposed a model to obtain the length of the day and month at any geologic time. The day is found to increase by 0.002 sec/century since the seventeenth century. The lengthening of the day is attributed entirely to the increasing gravitational constant ($G$) with time that manifested its self in tidal forces. The data obtained are consistent with those found from Palaeontology. The length of the day 4500 million years ago was 6 hours and the synodic month was 56.26 present epoch days.
Presented at the 9th UNESCO / ESA Workshop on Basic Space Science, 27-30 June 2000, Toulouse-France

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