The spring, summer, autumn and winter seasonal calender is a RW temperate zone invention because those are the distinctive weather patterns in that zone. Tropical areas traditionally use ones based on their significant variations which can be rain or wind.
I'd go with Gloranthan seasons being reflected in their local calendars. So for Dragon Pass there are five - one very wet, one stormy, one cold and dark, one hot and one a comfortable mixture of warm and moist. Sacred time comes between storm and sea seasons but probably has some very strange weather reflecting mythical struggles rather than what preceeds and follows it.
How to reconcile the references to spring, summer and winter in the published material? I'd go for nearest fit translations. So "winter" actually refers to dark and/or storm season. "Spring" is sea and/or earth season while "summer" is fire season.
-- Donald Oddy http://www.grove.demon.co.uk/
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