01-16-2016, 02:35 AM
(01-14-2016, 11:58 PM)Fred_B Wrote: Yes, I'm up for it. The haversine tables I got off the web somewhere last year. Bowditch 1972 vol. 2 has 'em also. You have to buy the 1972 edition now. Confound it.
Unless I'm in error the only problem with Doniol is that you're only obtaining Hc. Never figured out how to get Zn yet.
It certainly is one of those "no batteries required" method to get Hc.
Louis, do you know the formula to obtain a haversine of an angle like 45° ?
Fred, the formula to get a haversine is; haversine of x= [1- cos(x) / 2
That's to get the haversine of an angle (1- cosine(angle)) divided by 2
So, the haversine of 45° is .1464