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richarda's avatar

This is a note on errors and variations found that I may expand into a new post at a later date.

I ran some calculations on years 991 to 1005, adapting for leap years and so forth.

I noted variations probably attributable to lunar orbits of the order of plus or minus 0.0001 on a notional standard solar insolation of 1.00 with a frequency of over 12 per year.

A further variation of a similar magnitude was noted with a period of the order of one calendar year.

Variations on the calculated total solar insolation over 365 calendar days were of the order of plus or minus 0.139 KWh/sq M/year on an average of 12.26952 MWh/sq M/year.

The 15 years assessed is a small fraction of the 3,000 or so years that need consideration when assessing Climate Change on a planetary timescale.

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richarda's avatar

I find it more convenient to calculate the earth's annual TSI in more conventional units, for example :

1,400 W/Sq metre x 24 hours x 365.25 days /1,000,000 = 12.2724 MWh/sqMetre/year.

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