NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Douglas Denny
Date: 2010 Mar 3, 02:45 -0800
Delta-T. Seasonal variations:
I vaguely remember there being an explanation of seasonal variation in the Earth's rotation due to the seasonal rising of sap in the forest canopy of the biosphere minutely changing the angular momentum of the Earth.
How this figures if so between the two hemispheres North and South at different seasons is intriguing to me; and if a real effect, when the height of forest canopy is only say 20 Metres or so and hence a minute fraction of the radius of the Earth.
I cannot point to any paper on this and cannot even remember where I first heard of it. It might be apocryphal.
Douglas Denny.
Chichester. England.
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