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  while (read_from_file(&newzip, &newlat, &newlon)) {
    mydist = great_circle_distance(newlat,newlon,origlat,origlon);
...
    }
    ...
  }

  float dist1cosine = cos(25.0 / EARTH_RADIUS);
  float dist2cosine = cos(50.0 / EARTH_RADIUS);
...
    }
    ...
  }

   static inline float great_circle_distance_cosine(float lat1,
                                             float long1,
...
                      sin(lat1) sin(lat2) */
           return (temp1 + temp2);
   }