The
black line is the mean longitude of perigee
(computed by a formula in Meeus: "Astronomical Algorithms")
increasing by about 41° per year. The rotation is prograde
(direct).
The horizontal axis is showing the number of subsequent
perigees.
The horizontal axis is showing the number of subsequent perigees.
Tthe
mean logitude of the ascending node decreases by about 19° per
year;
retrograde rotation of the line of nodes.
The horizontal axis is showing the number of subsequent
perigees.
The horizontal axis is showing the number days after 2004, Jan 1.
The
horizontal axis is showing the number months after 2004, Jan 1.
The excentricity is computed by the distances of the previous and
next perigee and apogee.