LAN equation and definition of location

mastermi

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Hi I have found the equation describing dependencies between LAN, RAAN nad GAST(Longitude of ascending node, Right ascension of ascending node, Greenwich apparent sidereal time). So this equation is: LAN=RAAN-GAST.
Ok I found on my notice the diagram showing this relation, but I could be wrong.
GAST -angle between GM(Greenwich meridian) and Line of nodes.
RAAN-angle between Vernal Equinox and Line of nodes.
My question is how can I interpret this equation? Does it connect relation between ECI and ECEF?

My second question is about definition of location and position. Position is a point with parameters longitude latitude and height(I mean 3-dimensional system), but what about location?
I will be gratefull for help.
Matthew
 
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