### Determination of Length of (Earth) Day [LOD] in the past geologic epochs

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**Fri Feb 21, 2020 4:37 pm****Determination of Length of (Earth) Day [LOD] in the past geologic epochs**

**Abstract**: The protocol describes the algorithm of arriving at LOD in a given past geological Epoch. First the lunar orbital radius of the given geologic epoch has to be determined. For this the velocity of recession of Moon for the accelerated phase has to be determined. The spatial integral of the reciprocal of Velocity of recession gives the the transit time of Moon from desired orbit to the present orbit.Through several iterations the transit time is made to converge on the geologic epoch. Once we determine the desired orbital radius it has to be substituted in the LOD expression to determine the LOD in the given geologic epoch.

**Credit**: Sharma, Bijay K.

**Site**: https://doi.org/10.1038/protex.2019.017