Simon Cassidy on the tropical year and seasons

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Simon Cassidy on the tropical year and seasons

Peter Meyer
Since the "mean tropical year" has been mentioned here quite a lot
recently, as also calendars defined in terms of "seasons" (which these
days, because of climate change, will probably vary more than in the
past), members of CALNDR-L may care to acquaint themselves with Simon
Cassidy's articles on these subjects:

Error in Statement of Tropical Year
https://www.hermetic.ch/cal_stud/cassidy/err_trop.htm

The Tropical and the Anomalistic Year
https://www.hermetic.ch/cal_stud/cassidy/tropanom.htm

Re: lengths of "seasons"
https://www.hermetic.ch/cal_stud/cassidy/len_seas.htm

See also his "Stonehenge Speaks"
https://www.hermetic.ch/cal_stud/cassidy/shspk1zc.pdf

Regards,
Peter