NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Great Circle Initial Course Boston to Wellington?
From: Gary LaPook
Date: 2017 Dec 2, 00:12 +0000
From: Bruce J. Pennino <NoReply_Pennino@fer3.com>
To: garylapook@pacbell.net
Sent: Friday, December 1, 2017 2:24 PM
Subject: [NavList] Great Circle Initial Course Boston to Wellington?
From: Gary LaPook
Date: 2017 Dec 2, 00:12 +0000
Your 215 computation is wrong.
gl
From: Bruce J. Pennino <NoReply_Pennino@fer3.com>
To: garylapook@pacbell.net
Sent: Friday, December 1, 2017 2:24 PM
Subject: [NavList] Great Circle Initial Course Boston to Wellington?
Hello:
A New Zealand friend and I were just talking about a direct flight; distance and initial course from Boston. I easily calculated the distance using cosine D (distance) equation from navigator's triangle and course using Cos A equation,etc. The distance is about 7,940 NM checked on-line and Cos A equation indicated Z about 215 degr. True. I looked at a globe and seems to make sense. But I wanted to check it with H.O. 208 Dreisonstok. Distance confirmed at about 7,920 ,NM, but initial course Z = 250 degrees? Can't find a math error in either calc. Initial great circle course is ???
thank you and best regards.
Bruce
