On Friday, November 30, 2018 at 2:15:34 PM UTC, Chris L Peterson wrote:
On Fri, 30 Nov 2018 01:36:04 -0800 (PST), StarDust
wrote:

https://www.youtube.com/watch?v=rIesWBTUeiI

It's called Geostationary Oscillation. Not all geo sats are directly above the equator, they can be slightly inclined whether by design or insertion failure. The satellite's gyros will compensate for the movement to keep the footprint centered. Sirius XM sats do a huge "figure 8" from North to South and back to ensure a uniform footprint for moving vehicles. A. Kemp - Lockheed Martin Astronautics?

By definition, all geostationary satellites are above the equator, and
do not oscillate. If they are inclined, by have a 24 hour orbit, they
are called geosynchronous, and show that north/south oscillation.

All geostationary satellites are geosynchronous, but not all
geosynchronous satellites are geostationary.

Cracks me up !, the nuisances will be along soon to tell the newsgroup that a geostationary satellite doesn't remain fixed to a longitude meridian as the planet 'doesn't' turn once each 24 hours or at a rate of 15 degrees per hour.

A geostationary satellite doesn't include information of the surface rotation parallel to the orbital plane as a function of the Earth's orbital motion and best understood by the motion of the North/South Poles in small circles coincident with the Arctic/Antarctic circles. Copernicus originally got it right -

" The third is the motion in declination. For, the axis of the daily rotation is not parallel to the Grand Orb's axis, but is inclined [to it at an angle that intercepts] a portion of a circumference, in our time about 23 1/2°. Therefore, while the earth's center always remains in the plane of the ecliptic, that is, in the circumference of a circle of the Grand Orb, the earth's poles rotate, both of them describing small circles about centers [lying on a line that moves] parallel to the Grand Orb's axis. The period of this motion also is a year, but not quite, being nearly equal to the Grand Orb's [revolution]." Copernicus , Commentariolus

http://copernicus.torun.pl/en/archiv...=transkrypcja&


Strange that this under-developed adult would venture into a thread where planetary rotation is being discussed after spending two decades hiding in the shadows.