The effect of Mars' interior structure, more precisely the influences of the size and the state of the core, on Length-of-Day variations (ΔLOD) is studied.
These Doppler measurements will be used to obtain Mars' orientation in space and rotation (precession and nutations, and length-of-day variations).
We compared our results with the GNSS-derived length-of-day (LOD) estimates of CODE and the International GNSS Service IGSS) and find slight improvements of agreement by up to 1 μs for both INT1 and INT2 sessions with gradients from CODE.
The study of their causes involves in different fields of physics, from astronomy for the rigid Earth nutation, through internal geophysics for the length-of-day variation at the decadal time scale, to external geophysics for seasonal polar motion.
We predict the perturbation to the Earth's length-of-day (LOD) over the Common Era using a recently derived estimate of global sea-level change for this time period.
Related sites Xiao-Hai Yan's Web page More on the geodynamic effects of the ocean More on length-of-day variations.
What is the length of day at the equator?
Temperature change, length of day, and food availability play major roles in initiating the phases.
Topics: Sun's path in the sky, Sun's height in the sky, Sun-Earth motions, length of day, degrees.
