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sat tracking theory 2

hi all,
thanks for everyone who sent emails with help on the subject.

i've been busy trying to understand the maths involved in tracking the sats
and i am confused in two points:
1) the diference between the semi-major and minor axis of the earth is only
around 22 Km ??
i guess this is right but i thought it was more, and i was wondering what
error % would be introduced if i considered it to be perfectly round.
compared to an orbit altitude of 2000 Km, this would only be 1% in diference

2) positive longitudes are West right ? thus a positive longitude will
result a negative value in the X axis in a geocentric coordinate system ?
this sounds odd to me.

luis martins
lat = 38, lon = 9 ~ lisbon

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