zenith

Zenith means the high point––it comes from astronomy, where it describes the highest point in an arc traveled by a star or a planet or another celestial body. The sun reaches its zenith when it is as high in the sky as it is going to go on that day.

Zenith — and its opposite, nadir — have been appropriated by non-astronomers and are used to describe high and low points in non-astronomical contexts. For example, you can say that the high school quarterback hit his zenith in high school, and it was all downhill from there. Do yourself a favor and try to delay your zenith so you'll have something to look forward to in your future!

Definitions of zenith
1

n the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected

Antonyms:
nadir
the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
Type of:
celestial point
a point in the heavens (on the celestial sphere)

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