Explanation:


Declination is the horizontal angle between the magnetic meridian and the true meridian at a place. It is also known as magnetic variation. It is the angular difference between the direction of the magnetic field and the direction of true north. The declination is measured in degrees, and it varies from place to place on the Earth's surface. The magnetic north pole is not located at the same point as the geographic north pole, and this causes the declination.

Importance:


Declination is an important factor to consider when navigating. It helps in determining the true direction of a compass needle. The magnetic needle of a compass points towards the magnetic north pole, and the angle between the magnetic needle and the true north is the declination. By knowing the declination, one can adjust the compass reading and get accurate directions.

Significance:


The declination is not constant and changes with time. Therefore, it is important to keep track of the changes in declination and update the navigation charts accordingly. In addition, declination is used in surveying, map making, and in determining the location of natural resources like minerals.

Difference between Azimuth and Declination:


Azimuth is the angle between the north point and the direction of an object or point. It is measured in degrees clockwise from the north. On the other hand, declination is the angle between the magnetic and true north. Hence, azimuth and declination are two different angles used in navigation and surveying.

Conclusion:


Declination is an important factor in navigation and surveying. It helps in determining the true direction of a compass needle and is essential for accurate navigation. It is important to keep track of the changes in declination and update the navigation charts accordingly.