# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Formula for dis. between two points on the Globe
From: Pierre H Boucher
Date: 1996 Oct 21, 15:21 EDT

<Ben Smith wrote :
>Hello,
>Is there somebody that hase the Formula to calculate the distans
>between two points on the globe.
>eg. 52 29.66N  and 52 32.86N
>     005 02.45E     004 40.67E
>My GPS tells me that it is 13.6nm        CTS106
To compute the distance the formula is:
Distance = arcCOS (( sinL2  x  sinL1 ) + ( cosL2 x cosL1 x cosDLo ))
To compute the course:
Course in quadrant = arcCos (( sinL2 - ( cosD x sinL1 )) / ( sinD x cosL1 )
L1 and L2 = Latitudes
DLo = Difference of longitude
D = distance as compute by the first formula
Important note:
convert all datas as dd.dddd  Ex: 52d 29.66' = 52.4944d
If L1 and L2 are of contrary names enter L2 as negative.
Hope this help,
Pierre Boucher N
CPS code 16-32

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