Question

Earth’s magnetic field changes over time. True or False?
GPT 3.5
True. Earth's magnetic field has changed in both strength and direction over geological time scales. This phenomenon is known as geomagnetic secular variation.
Damon
If you look at the compass rose on any maritime chart, it lists the yearly change in direction of the magnetic north pole there. (Variation)
GPT 3.5
True. The periodic variation in the Earth's magnetic field causes the magnetic north pole to move over time. This change in direction is known as magnetic variation, and nautical charts typically include information on the yearly trend of this variation to aid sailors in navigation.