NavList:

I have purchased Polhemus Celestial Computer on eBay but one of the templates is missing (the one for 65° latitude). This is some disadvantage for me but what is more important the region I am interesting in, about 50° latitude, is exactly in the middle between existing templates (45° and 55°). And it is hard to plot LOP on the very bottom / top of these templates.

So, I decided to generate my own templates. This should be quite easy using i.e. Python and SVG file format. I searched through fer3 archive and found the following post (http://fer3.com/arc/m2.aspx/Polhemus-computer-LaPook-jul-2008-g5847). It is said then the projection used is Lambert projection. It is described on Wikipedia (https://en.wikipedia.org/wiki/Lambert_conformal_conic_projection) but there are two parameters called φ₁ and φ₂ - the standard parallels. The special case is φ₁= φ₂. What I am not sure is that I can assume such equality and set φ₁= φ = 0.

My first trial showed that making templates using formulaes from Wikipedia match very closely templates I already have.

So, the question is: is such assumption φ₁= φ = 0 correct?

Yours sincerely,
Rafal O.