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What Spatial Reference System do I store Google Map's Lat/Lng in [duplicate]

I am new to PostGIS, Spatial Reference Systems and projections and want to store lat/lng coordinates retrieved from Google Maps and its services like the Geocoder. I'm working with data in America and ...
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Center-to-Center distance [duplicate]

Possible Duplicate: What is the right solution (and map projection) to compute distances between points located all over the World? I want to know how I could calculate the center-to-center ...

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