merong Posts: 1, Reputation: 1 New Member #1 May 27, 2010, 07:01 PM
How do I calculate the longtude and latitude on earth
A point is plotted on a Mercator projection within China. Calculate the longitude and latitude of the point exactly on the opposite side of the earth (i.e. antipodal) to that point. It is the point from which you could dig stratight down to reach China.
 ballengerb1 Posts: 27,379, Reputation: 2280 Home Repair & Remodeling Expert #2 May 27, 2010, 08:18 PM

Are you saying you don't know the point's lat or long either? A Mercator is labeled with lat and long, pretty much a wothless map I might add.
 FlyYakker Posts: 378, Reputation: 41 Full Member #3 May 29, 2010, 02:11 PM

Longs' and Lats' are valid no matter what map used. Mercators merely distort things a bit. Probably being used in this exercise because it DOES distort things - making it hard to fudge the answer.

I believe the point is that merong has been given the location in China and needs to know what is directly opposite. On a sphere, points directly opposite are 180 degrees away from each other.
 jmjoseph Posts: 2,727, Reputation: 1244 Ultra Member #4 May 29, 2010, 02:42 PM

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