At an equinox, one planetary event opens opposite seasonal directions. In one hemisphere, daylight is shortening; in the other, it is lengthening. The event is shared. Its consequence depends on position.
Ancient observatories found stable relationships in the Sun’s movement without requiring every horizon to look alike.
The same distinction matters when people experience one event differently. Begin with two questions:
What remained constant?
What changed with position?
The first keeps perspective anchored to reality. The second prevents a true fact from being mistaken for the whole account.
Without a shared constant, perspective can dissolve into private realities. Without attention to position, fact can be used to erase consequence.
Agreement about what happened does not require identical experience. Different experiences do not mean reality has broken apart.
The sky follows one motion. Earth gives it many horizons.