Calculate distance between Latitude and Longitude

Hi All,
I have one Latitude and Longitude points. I need to calculate distance between them.
Right now we are using HAVERSINE formula but the query takes longer time to complete.
Reference: http://www.movable-type.co.uk/scripts/latlong.html
Please assist on this.
Thanks in advance.

Check this link...
http://www.mrexcel.com/forum/excel-questions/202255-calculating-distance-between-two-latitude-longitude-points.html
I never did this before, but gave it a try using the formula mentioned in that link..
Data:
                   Lat                      Long                               R = 6,371 (Radius of earth (approximated))
Origin:        44.844263(B2)      -92.914803(C2)
Destination: 44.822075(B3)     -92.912498(C3)
Formula used:
A: =SIN(ABS(B3-B2)*PI()/180/2)^2+COS(B2*PI()/180)*COS(B3*PI()/180)*SIN(ABS(C3-C2)*PI()/180/2)^2
B: =2*ATAN2(SQRT(1-A),SQRT(A))
C: =R*B                  ---> DISTANCE!!!!
WITH t AS
        (SELECT POWER (
                   SIN (ABS (44.822075 - 44.844263) * ( (22 / 7) / 180 / 2)),
                   2)
                + COS (44.844263 * ( (22 / 7) / 180))
                  * COS (44.822075 * ( (22 / 7) / 180))
                  * POWER (
                       SIN (
                          ABS (-92.912498 - (-92.914803))
                          * ( (22 / 7) / 180 / 2)),
                       2)
                   E2
           FROM DUAL)
SELECT (2 * ATAN2 (SQRT ( (1 - E2)), SQRT (E2))) * 6371
FROM t;
Check if this gives correct values... (I did not verify this properly.. ) And this is faster in my opinion..
Please post your code for better suggestions from volunteers...
Cheers,
Manik.

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