if I understand it correctly the doctest has an example for negative lon value of -71 but we are raising a value error exception in line #706 do you think this would work and we are not testing for the negatived lon values which I think could be the case. so I think we should allow and test for negative lon values!
I have remove the lat lon limits, and add one more test with negative number.
I have remove the lat lon limits, and add one more test with negative number.