title: Algorithm to find all Latitude Longitude locations within a certain distance from a given Lat Lng location
body: <p>Given a database of places with Latitude + Longitude locations, such as 40.8120390, -73.4889650, how would I find all locations within a given distance of a specific location?</p>
  
  <p>It doesn't seem very efficient to select all locations from the DB and then go through them one by one, getting the distance from the starting location to see if they are within the specified distance. Is there a good way to narrow down the initially selected locations from the DB? Once I have (or don't?) a narrowed down set of locations, do I still go through them one by one to check the distance, or is there a better way?</p>
  
  <p>The language I do this in doesn't really matter. Thanks!</p>