Precession of the equinoxes ?

From: "Tom Linden" <tom@xxxxxxxxxx>
Date: Sun, 05 Nov 2006 15:33:11 -0800

I was looking at some data,

http://aa.usno.navy.mil/data/docs/EarthSeasons.html

I could not figure out why the duration between Winter solstice and the immediately
following perhelion jumps around. We know that the perhelion should advance one
day on our calendars about every 71 years. So you would think there should be about
a 20 minute increase from one year to the next. Anybody have an explanation?

Tom

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