title: Need a radius around a latitude and longitude location
body: <p>So I got a FQL query and I got the latitude and longitude of a person.</p>
  
  <p>ex: Latitude: 51.219215899999990000 and Longitude: 4.402881799999932000</p>
  
  <p>Now this is a location and I need like all the events in a radius of 50000 meters around those coordinates.  So I got my FQl query: </p>
  
  <pre><code>WHERE uid1 = me() LIMIT 500 ))  AND start_time&gt;'" + startTime + "' 
      AND start_time&lt;'" + endTime + "' AND venue.latitude &lt; "NEED" 
      AND venue.latitude &gt; "NEED" and venue.longitude &lt; "NEED" 
      AND venue.longitude &gt; "NEED" 
  ORDER BY attending_count DESC 
  LIMIT 25
  </code></pre>
  
  <p>Everywhere where there is NEED I need to put in coordinates so I get a radius of 50000 meters of the location of the person. How can I calculate this?</p>