Correct Answer - Option 3 : the angle between the true meridian and the magnetic meridian at a place
(i) It is quite a common phenomenon that the magnetic meridian and the true meridian at a place generally do not coincide.
(ii) The horizontal angle which the magnetic meridian makes with the true meridian is called as magnetic declination (also sometimes referred as declination).
(i) When magnetic north lies towards the west of true north, then the declination is said to be negative.
(i) If the magnetic north lies towards the east of true north, then declination is said to be positive.