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Aha. We have fallen victim to a wide spread terminological confusion.
"Double Altitude Method" is historically the method of determining
latitude from two altitude observations of the sun spaced apart by a
known time interval. You seem to mean "Method of Equal Altitudes".
Nowadays the term is often used for "Method of Combined Altitudes" in
general (when exactly two altitude observations are given). I understood
it in the latter sense. As far as I can see from R.Stuart's post, there
is nothing that prevents his method to be applied to the general case of
two different bodies.

Herbert

James N Wilson wrote:
> Herbert:
>
> Because that's the only time when declination isn't changing.

   

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