der Zenit
zenith
The high point or peak of a development, a career, or of power and prestige.
Mit diesem Erfolg hatte der Künstler den Zenit seiner Karriere erreicht.
With this success, the artist had reached the zenith of his career.

zenith
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zenith
The high point or peak of a development, a career, or of power and prestige.
Mit diesem Erfolg hatte der Künstler den Zenit seiner Karriere erreicht.
With this success, the artist had reached the zenith of his career.

You can recognize the meaning from the context. If people are talking about 'Sonne' (sun) or 'Himmel' (sky), the astronomical point is meant. If it is about 'Karriere' (career), 'Macht' (power), or 'Erfolg' (success), the figurative high point is meant.
Mittags, wenn die Sonne im Zenit steht, sollte man die Haut schützen.
At midday, when the sun is at its zenith, you should protect your skin.
In the figurative meaning, 'Zenit' (zenith) is often used with certain verbs. Typical phrases are 'den Zenit erreichen' (to reach the zenith), 'auf dem Zenit sein' (to be at the zenith), or 'den Zenit überschreiten' (to pass the zenith).
Nach diesem Album hatte die Sängerin den Zenit ihrer Kreativität überschritten.
After this album, the singer had passed the zenith of her creativity.
The high point of something is often expressed with the genitive or with the preposition 'von' (of/from). Both are correct: 'der Zenit seiner Macht' (the zenith of his power) or 'der Zenit von seiner Macht' (the zenith of his power).
Er stand auf dem Zenit seiner politischen Macht.
He stood at the zenith of his political power.
The figurative meaning of 'Zenit' (zenith) is used mainly in written language, in journalistic texts, or in formal speeches. It is a word with an elevated style.
Die römische Kultur erreichte unter Kaiser Augustus ihren Zenit.
Roman culture reached its zenith under Emperor Augustus.
wedding / heyday
'die Hochzeit' and 'der Zenit' can both mean, in a figurative sense, the highest point of a development. 'Hochzeit' tends to describe an especially strong or successful time, often for an era, fashion, or movement. 'Zenit' means the peak of power, success, prestige, or a career and sounds somewhat more elevated. 'Hochzeit' can also mean a wedding celebration; 'Zenit' cannot. If you are describing the highest point of a career or of power, 'Zenit' fits especially well.

Mit diesem Film erreichte die Schauspielerin den Zenit ihrer Karriere.
With this film, the actress reached the zenith of her career.
In der Hochzeit des Radios hörten viele Familien jeden Abend gemeinsam Nachrichten.
In the heyday of radio, many families listened to the news together every evening.