any point facing and heading the opposite way of
gravity. since the phrase "over and above" is a bit hard to apply to this,
zenith has been referred to a point above something that might block its direct "connection" to the center of the
gravitational pull.
...I assume, based on what I was taught.
you are standing on the earth, your "
connection" to the earth is your feet, the very, very
tip of your head is where
zenith arises and moves "upwards."