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Definition of zenith : 1. hence, figuratively, the point of culmination; the greatest height; the height of success or prosperity.
2. That point in the visible celestial hemisphere which is vertical to the spectator; the point of the heavens directly overhead; - opposed to nadir.

Synonyms:

height, meridian, payoff, high, fastigium

restricting, limiting, terminating, utmost, constraining, restraining, confining, bounding

boundary, limitation, cutoff, restriction, terminus, border, bounds, extremity, limit, rim, end, deadline, fringe, brink, confines, edge

immortality, mountaintop, acme, nirvana, heaven, summit, ether, Eden, azure, fairyland, joyfulness, everlastingness, goshen, happiness, spire, rhapsody, glory, culmination, Zion, wonderland, eternity, afterworld, stratosphere, apex, Canaan, bliss, shangri-la, hereafter, pinnacle, ecstasy, dreamland, land o'goshen, climax, paradise

culminating, crown, peak, highest point, uppermost point, capping, extreme, brow, crest, topmost point, topmost, tip, cap, highest, loftiest, top

maximum height, elevation, tiptop, roof, culminating point, eminence, apogee, altitude

crowning, furthest, foremost, master, consummate, champion, king, choice, chief, senior, dominant, controlling, best, maximum, signal, sovereign, elite, leading, A-1, eminent, above, paramount, most, predominant, quintessential, furthermost, ruling, chosen, supreme, superior, better, commanding, headmost, uppermost, ascendant

Usage examples:

• In like manner, the size and aspect of the comets are of every character, from the dim spot just visible to an eye fortified by a mighty telescope, up to a gigantic and brilliant object, with a tail stretching across the heavens for a distance which is as far as from the horizon to the zenith. - "The Story of the Heavens", Robert Stawell Ball.
• At that moment the sun of Dupleix's fortunes reached its zenith. - "A History of the Four Georges, Volume II (of 4)", Justin McCarthy.
• But the sun of her happiness had passed its zenith and was on the decline. - "The Stronger Influence", F.E. Mills Young.