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Subject: Re: Coordinate on sphere(vector calculus)
Date: Thu, 25 Mar 2010 18:12:06 +0000 (UTC)
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"Roger Stafford" <ellieandrogerxyzzy@mindspring.com.invalid> wrote in message <hog4r7$otg$1@fred.mathworks.com>...

>
>   That depends on which angle is 90 degrees, the angle between OP's "Center-P1" and "Center-P2" or between "P1-P2" and "Center-P2".  That was not made clear by the OP.
============ 

Perhaps. When the OP said the angle CenterP2P1 must be 90, I definitely took that to mean the angle at the vertex P2. That's a convention I've seen before.