[snip]
I procured myself some zip/lat/long databases from various places. Then
I
noticed that for the same zip code, I got different values in different
databases??!!!
[/snip]

Latitudes and longitudes are often represented based on their location
relative to the equator and the prime meridian;

                      |
             pos lat  | pos lat
             neg long | pos long
                      |
                      |
---------------------------------------------------
                      |
             neg lat  | neg lat
             neg long | pos long
                      |
                      |

Sometimes the coordinates are based on positive distances (non-standard
lat/long) from the prim meridian and equator, yielding a pai of positive
numbers for each coordinate that would not be the same numbers as given
by the standard system.

Google Maps understands the standard system well, I do not know if it
understands the non-standard system

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