March 8, 2012 10:18 AM Subscribe
Which would be the correct way to subtract coordinates that are on different sides of the equator?
posted by Deflagro to Science & Nature (5 answers total) 1 user marked this as a favorite
I was going off of this
explanation for my longitude, but now I'm not so sure with my latitude. The first set is South and the intended final set (after the subtraction) is North. What I would like is to be able to give someone a set of Coordinates tell them to subtract this (with another set without North/South) and they would end up with the final set in North
Here's an example: The original coordinates can be S 90° 42' 30" and I want to tell them to subtract 120° 21' 70". Do I still need to borrow from the 42' so that 30" can become 90" (and the answer being 20")? Or can I just treat each one individually so that the the inches would end up being 40" by treating the Southern coordinates like a negative? (I'm only focusing on the Inches since I assume the technique would be applied to the rest)
I've tried looking on Google for the answer, but I haven't been able to find it.