The difference between the present Equinox and the one which will
occur half an annual orbit from now is that the orbital turning of a
location is speeding up in accordance with Kepler's view of orbital
speed and geometry whereas at the opposite Equinox the Earth's orbital
turning to the central Sun will be slowing down as the Earth moves
towards aphelion.This variable speed will show up also as variations
in the natural noon cycle.
The YouTube time lapse footage showing the orbital change is
slightly problematic for interpreters for although it is taken from a
rotational stationary point of view,there is no means to allow a
stationary orbital view however the distance from Uranus from the Sun
along with its unique dual features of rotational orientation and
Equatorial rings fill in the gap to a more productive view of the
seasonal explanation by relying on the relationship between daily
rotational and annual orbital motions to each other and to the central
Sun.
http://www.youtube.com/watch?v=nwTrYVBcx9s