The angle of dip at the magnetic equator of the Earth is:

The angle of dip (or magnetic inclination) is the angle between the horizontal plane and the direction of the Earth's total magnetic field at a given location. It changes systematically with magnetic latitude, reaching its minimum where the field is purely horizontal and its maximum where the field is purely vertical.

At the magnetic equator, the Earth's magnetic field lines run parallel to the surface — the field has no vertical component there — so the angle it makes with the horizontal is 0°. Moving away from the magnetic equator toward either magnetic pole, the field tilts increasingly into the surface, so the dip angle rises steadily along the way.

• 0° — the magnetic equator, where the field is horizontal (this question's location).

• 90° — the magnetic poles, where the field is vertical.

• 45° — an intermediate magnetic latitude, partway between equator and pole.

• 180° — outside the valid 0°-90° range for dip; it does not describe any location's field orientation.