geostationary orbit
... that satellites in a geostationary orbit appear stationary in the sky to a ground observer?
... that satellites in a <b id="mwAlw"><a href="./Geostationary_orbit" id="mwAl0" rel="mw:WikiLink" title="Geostationary orbit">geostationary orbit</a></b> appear stationary in the sky to a ground observer?