DPRG List  

[DPRG] math

Subject: [DPRG] math
From: David P. Anderson dpa at io.isem.smu.edu
Date: Wed Sep 29 00:20:51 CDT 2004


I wrote:

> That's 0.000699 angular degrees.  For earth radius of 69.172 that's
> 69.172 * 0.000699 = .048351228 * 5280 = 255.294483849 so call it
> 255.3 feet for last weekend's contest.  Does that sound right?

but in point of fact an earth radius of 69.172 does not sound right
at all.  That should be, 

"For an average earth radius, there are 69.172 miles per degree, so..."

Typing faster than thinking, which at this late hour is not hard.


More information about the DPRG mailing list