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Numbers of days between solstices and equinoxes
by Simon at 23:48 20/09/11 (Blogs::Simon)
I've been meaning to do this diagram for a while, showing why equinoxes aren't halfway between solstices. Finally got round to it.
Diagram of Earth orbit showing counts of days between solstices, equinoxes and equalday/nights

And one with the cross quarter days calculated according to Merlin of England's method of defining two "equidistants" halfway between each pair of solstices (WS to SS and SS to WS) and then the cross quarter days being halfway between equidistants and solstices.

As above, including cross quarter days


JPG image (147 K) Orbit diagram and day counts
PNG image (36 K) Orbit and day count diagram inc cross-qtr
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Numbers of days between solsti... There is an attachment here Simon - 20/09
    Re: Numbers of days between so... Dominic Search - 13/10