[rgwocfen] Where is the equator?

The north and south poles very slowly drift.  There are ceremonies at South Pole "Station" (therefore not actually stationary with respect to the pole) to mark the new location of the pole each year.  Consequently, we expect the equator to move over time also, but there aren't ceremonies that I've heard of.

The equator probably remains fixed according to some coordinate system for geolocation and navigation, so is not actually exactly halfway between the poles.