Here is another interesting thing: If you are in ArcGIS Online - if you search for example on 40, -120 it will place you on the Nevada-California border at 40 North 120 West, as it should - but it displays Y=-120, X=40. If you search on -120, 40, it works the same way and the position is accurate. Google maps only works one way - as "latitude, longitude" or Y, X - so in Google Maps -- - 40, -120 works but -120, 40 does NOT work.
--Joseph Kerski