Question

Define angle of declination at a place :

• A. angle between the vertical plane and the geographical meridian
• B. angle between the vertical plane and the magnetic meridian
• C. angle between the geographical meridian and the magnetic meridian
• D. angle between the geographical meridian and horizontal plane

Answer 1

The correct option is C angle between the geographical meridian and the magnetic meridian

The magnetic meridian is an equivalent imaginary line connecting the magnetic south and north poles and can be taken as the magnetic force lines along the surface of the earth. Therefore a compass needle will be parallel to the magnetic meridian.
The angle between the magnetic and the true meridian is the angle of declination, which is relevant for navigating with a compass.