Math help needed - Warning complex equation!!....read only if brain is in stable conditon

[Mark Jackson]

jranchordas at hotmail.com (Jay) writes:
> right, now that I got your attention, I need help on the following
> piece of python code:
> 
> distance = 1.15 * (180 * (acos((sin(pi * lat1 / 180) * sin(pi * lat2 /
> 180)) + (cos(pi * lat1 / 180) * cos(pi * lat2 / 180) * cos(pi * (lon2
> – lon1) / 180))) / pi) * 60)

--^^-- what's this weird character here where a "-" ought to be?

-- 
Mark Jackson - http://www.alumni.caltech.edu/~mjackson
	A retired physicist reading the /Encyclopaedia Britannica/
	can do just so much toward securing world peace.
				- Brian Hayes