What is a geographic meridian? How does the declination vary with lati

1.	What is a geographic meridian? How does the declination vary with latitude? Where is it minimum?
Answer» A plane perpendicular to the surface of the Earth (vertical plane) and passing through geographic axis is geographic meridian. i. Angle between the geographic and the magnetic meridian at a place is called magnetic declination (a). ii. Magnetic declination varies with location and over time. As one moves away from the true north the declination changes depending on the latitude as well as longitude of the place. By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. The declination is small in India. It is 0° 58′ west at Mumbai and 0° 41′ east at Delhi.

What is a geographic meridian? How does the declination vary with latitude? Where is it minimum?

Answer»

A plane perpendicular to the surface of the Earth (vertical plane) and passing through geographic axis is geographic meridian.

i. Angle between the geographic and the magnetic meridian at a place is called magnetic declination (a).

ii. Magnetic declination varies with location and over time. As one moves away from the true north the declination changes depending on the latitude as well as longitude of the place. By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. The declination is small in India. It is 0° 58′ west at Mumbai and 0° 41′ east at Delhi.

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