There are plenty of theories floating about concerning the best methods for beating jetlag, very few of which come backed up with any serious scientific clout.

The SQL below should work:

SELECT*FROM Table1 a 
WHERE(
          acos(sin(a.Latitude *0.0175)* sin(YOUR_LATITUDE_X *0.0175)+ cos(a.Latitude *0.0175)* cos(YOUR_LATITUDE_X *0.0175)*    
                 cos((YOUR_LONGITUDE_Y *0.0175)-(a.Longitude *0.0175)))*3959<= YOUR_RADIUS_INMILES
      )