A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2022 Jan 26, 10:05 -0800
I don’t think this lady’s point was about local/Greenwich time difference. It was about the date page to be used. This mistake is almost impossible mid-flight with a modern Air Almanac because if your first astro is for a mid-time of 01:00 on 2nd July (I hope you’ve lightly underlined it in pencil), you just keep going down the same page for subsequent astro until you get to 23:50 when you turn onto the next page. So long as the Government was paying, some aficionados even tore the used pages out so they were always on the correct page.
However, we can only guess which type of almanac Noonan was using and indeed which method of calculation he was using. My point is; the lady gives herself away by using the Sun for an example of dire straits if the date is one day out (it only makes about 3 miles difference for the Sun, but about 60 miles for other stars, with a modern Air Almanac) unless she knows an awful lot more about Noonan’s methods and resources than we are giving her credit for. DaveP