title: Finding nearby latlng using firebase
body: <pre><code>-uniqueid1
              latitude: 30.7188235
              longitude: 76.810132
  -uniqueid2
              latitude: 30.7188235
              longitude: 76.810132
  </code></pre>
  
  <p>there are 1000 such records in firebase , I want to find uniqueids closest to a specific long/lat.I started using startAt() and endAt() but no success.How do we implement conditional clause and multiple queries.The query me looking for is</p>
  
  <pre><code>SELECT uniqueids from table where (lon-specific_lon)^2+(lat-specific_lat)^2&lt;CONSTANT.
  </code></pre>