Non dating

Since there are several planets interacting, the result is some complicated Spirograph loop-the-loops with several periods.

Models with relativistic corrections included lead to a reduction of about 0.05-0.08 ; Gyr with respect to those obtained with the old OPAL or MHD EOS.Our best-fit value is t = (4.57 /- 0.11) ; Gyr which is in remarkably good agreement with the meteoritic value for the solar age.We argue that the inclusion of relativistic corrections is important for probing the evolutionary state of a star by means of the small frequency separations delta nu/(G*M)for solar mass M, atom mass m, and core temperature T.It has been possible to observe continental drift directly with GPS satellites: GPS Time Series Furthermore, GPS-measured rates agree rather closely with continental-drift rates over the last several million years: Global Tectonics and Space Geodesy -- Gordon and Stein 256 (5055): 333 -- Science The latter sort of estimate gets its time values from radiometric dating, so GPS measurements provide a good check of them.These are due to variations in the amount of incoming sunlight due to the Earth's changing orbit shape and orientation, and also its spin precession.

It's been hard for me to find a review of the overall state of the art, however.