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Paul
As promised here is a pre-computed five shot two-star sandwich fix form for a Vulcan at 22:00 UT tonight and completed in time too!  I had to use an unofficial copy of 2025 Epoch HO249.  I couldn’t find my official copy on my PC.  Hc Alpheratz doesn’t quite tie in with my cross check against Navigator, but perhaps the Epoch is different.  I’ve left P&N as zero, because my unofficial HO249 didn’t have that table.  Note that on this form you change the sign of most of the corrections, because you’re pre-computing.  Note also that Corioli’s correction and P&N can also be taken care of by moving the assumed position.  Note also that the Vulcan had to have two sextant mountings, port and starboard, because our caring Government provided a multi seat life raft right behind the pilots.  This meant you could set up for two stars in advance and just jump across the cabin from sextant to sextant, which saved a lot of time.  I’ve also added a set of imaginary shots, but I had to make my acceleration errors average out to zero, because I’ve mislaid my Mears Slide for my Dalton Computer.  You can do it mathematically, but I keep having to re-work out the formula.  I’ve one correction.  In my previous post, I said you needed two assumed positions for a two-star sandwich switch.  I was certain we only used one, but I couldn’t remember why.  I realised once I started filling in the form.  You enter AP3270/HO249 Vol3 with Latitude and LHA Aries only.  You don’t need to worry about SHAs, Vol3 takes care of that for you, so yes, you only need one assumed position for a sandwich fix.  DaveP

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