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Message: <blockquote data-quote="cazhh" data-source="post: 872060" data-attributes="member: 391121">for now i'm only interested in my local area. It's here where i do the measurements and it's here where i know how the beam looks like.  i only talk about a rotation of the satellite around its z axis.   And i'm for now only interested in how many km of movement _on_ the surface of the earth that tiny rotation causes. To give you that distance you need to take into account that the earth is a sphere. And probably even more. Everything else would just give you an approximation.Having said that, the approximation seems to be good enough to suggest that the difference in signal i saw over the past year here in my location could be caused by the typical pointing error of a satellite. It would still be interesting if SES uses antenna tracking to reduce the pointing error. But we will probably not find out by looking at the measurements.</blockquote>