I think Latitude historically comes first when spoken or written because of the rule of ablaut reduplication, which makes it more natural for the 'a' sound to come before the 'o' sound when using phrases like this. For instance, 'bish, bash, bosh' sound natural/correct, but 'bosh, bash, bish' sounds wrong.
I get the order wrong when working with geojson with embarrassing frequency...
http://www.macmillandictionaryblog.com/a-hotchpotch-of-redup...