Incorrect output by SDO_GEOM.SDO_DISTANCE

I am trying to calculate the difference of two points on earth, but is not giving me correct result
SELECT SDO_GEOM.SDO_DISTANCE(
SDO_GEOMETRY(2001,8307,SDO_POINT_TYPE(28.66667,77.43333,NULL),NULL,NULL),
SDO_GEOMETRY(2001,8307,SDO_POINT_TYPE(30.45,77.61667,NULL),NULL,NULL),
0.0001,'unit=km') AS DISTANCE_BETWEEN_POINTS
FROM DUALI tested it against http://www.movable-type.co.uk/scripts/latlong.html
Query is returning me 47.6389006
but the actual distance is: 199.1
Please help me out.

I also tested it by
sqrt(x * x + y * y) * 1.609344 // for KM
where x = 69.1 * (lat2 - lat1) and y = 53.0 * (lon2 - lon1)
There is still a lot of difference.
SQL> SQL> SQL> SELECT SDO_GEOM.SDO_DISTANCE(
SDO_GEOMETRY(2001,8307,SDO_POINT_TYPE(28.66667,77.43333,NULL),NULL,NULL),
SDO_GEOMETRY(2001,8307,SDO_POINT_TYPE(30.45,77.61667,NULL),NULL,NULL),
0.0001,'unit=km') AS DISTANCE_BETWEEN_POINTS
FROM DUAL 2    3    4    5 ;
DISTANCE_BETWEEN_POINTS
             47.6389006
SQL> SELECT
sqrt(69.1 * (30.45 - 28.66667) * 69.1 * (30.45 - 28.66667) + 53.0 * (77.61667 - 77.43333) * 53.0 * (77.61667 - 77.43333)) * 1.609344
FROM DUAL 2    3 ;
SQRT(69.1*(30.45-28.66667)*69.1*(30.45-28.66667)+53.0*(77.61667-77.43333)*53.0*(
                                                                      198.932013Please help....

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SQL> SELECT * FROM LOC_ZIP;
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