jon roig wrote:

> Yeah... it's for US only, you're correct.

ZIP codes in continental US range from a lattitude of about 24 degrees 
to about 70 degrees. The mismatch between those is a factor 
cos(24)/cos(70), or about 2.7 and it gets worse if you account for 
Hawai, Guam, Puerto Rico etc.

Even if it is just for the US, the used approximation without correction 
for the lattitude is bad.

Jochem

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