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## Main Question or Discussion Point

Sorry if this is in the wrong forum.

I have the equation [tex]r = \frac{a(1-e^2)}{1+e \cos \theta} [/tex],

and I'm wondering what the physical significance of the numerator is.

More specifically, what is 'a' (since e is what it usually is)?

I've seen various other representations with terms like angular momentum on the top (or rather h^2/GM).

In the context of what I'm doing, it's written this way to (presumably) uncover any implicity 'e'-dependence in the orbit.

I have the equation [tex]r = \frac{a(1-e^2)}{1+e \cos \theta} [/tex],

and I'm wondering what the physical significance of the numerator is.

More specifically, what is 'a' (since e is what it usually is)?

I've seen various other representations with terms like angular momentum on the top (or rather h^2/GM).

In the context of what I'm doing, it's written this way to (presumably) uncover any implicity 'e'-dependence in the orbit.