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"The Sun is at its lowest path in the sky on the Winter Solstice. After that
day the Sun follows a higher and higher path through the sky each day until
it is in the sky for exactly 12 hours. On the Spring Equinox the Sun rises
exactly in the east travels through the sky for 12 hours and sets exactly in
the west. On the Equinox this is the motion of the Sun through the sky for
everyone on earth. Every place on earth experiences a 12 hours day twice a
year on the Spring and Fall Equinox."

http://solar.physics.montana.edu/YPOP/Classroom/Lessons/Sundials/equinox.htm
l

Until cel nav, observed for years and could never make it work.  For it to
be "exact" would not the sun have to be a point source, the declination
remain at 0d from sunrise to sunset, and refection be done be 0?

Bill

   

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