Bob,

See this page: http://www.castor2.ca/04_Propagation/07_Precess/index.html

73, Nico PA0DLO

On 15-11-2021 04:59, 73 Bob W7LRD wrote:

I am trying to find the equation for determining the rate of change of ARGP/day to determine the optimum time in the northern hemisphere for contacts with Europe from CN78 73 Bob W7LRD

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