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Re: The Great Circle Challenge
From: Gary LaPook
Date: 2014 Dec 26, 19:44 -0800

Or, just notice that the longitudes differ by exactly 180 degrees so the course must be 360 then 180. And notice that (90 - latitude 1) + (90 - latitude 2) = 60 degrees exactly. ( It can also be done as 180 -lat 1 - lat 2 also equals 60 degrees.)

From: Samuel L <NoReply_SamuelL@fer3.com>
To: garylapook@pacbell.net
Sent: Friday, December 26, 2014 7:25 PM
Subject: [NavList] Re: The Great Circle Challenge

Course- 0d ("over the top")

Distance- 3600 nm

Distance formuala-

60 x (90- sin-1(sin(58d 45min) x sin(61d 15min) + cos(58d 45min) x cos(61d 15min) x cos(180d))

Course formula-

tan-1(sin(180) / (cos(61d 15min) x tan(58d 45min) - (sin(61d 15min) x cos(180))

Time to figure this out- 5 minutes

Sam L.

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