What ALWAYS happens at the autumnal equinox? Day and night are of equal length.
The sun shines for 24 hours straight over the north pole.
Animals go into hibernation.
Winter officially begins.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .