orbit - Directly calculating lat/lon of a satellite directly from RA/declination

I have RA/declination values of a satellite and the observer's location in terms of lat/lon. I want to convert the values for satellite into lat/lon. I have tried to use the method which uses Greenwich mean sidereal time and local sidereal time but i am not getting the expected results. Following are the available values:

Right Ascension:14.664624,
Declination:77.531587,
Observer lat 21.732398,
Observer lon 70.290948