A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Peter Hakel
Date: 2018 Nov 17, 09:52 -0800
My calculation is not as detailed as yours but it comes out pretty close:
which falls near the lower end of your 4” error bar, since 42.9/60 = 0.715.
I used my precomputed lunar spreadsheet with Venus as “Moon” and Spica as “Body.”