Definition

1. Noun:
   • The point in the sky directly above an observer: In astronomy, the zenith is the highest point in the celestial sphere, directly overhead, opposite to the nadir (the point directly underfoot).
   • The peak or highest point of success, power, or development: Figuratively, the zenith refers to the time at which something is most powerful, successful, or brilliant.

Examples of Usage

• Noun (Astronomical):
  • The sun reached its zenith at noon. (The sun was at its highest point in the sky at midday.)
  • Astronomers measure the angle of a star from the zenith.
• Noun (Figurative):
  • Her career was at its zenith when she won the award. (Her career was at its most successful point.)
  • The empire's cultural zenith occurred during that century. (The empire's culture was at its peak development.)

Advanced Usage

• "To be at the zenith of": To be at the highest or most successful point of something.
  • The artist was at the zenith of his creativity.
• "To have passed one's zenith": To be past the peak period of success, power, or vitality.
  • Some critics argue the company has passed its zenith of innovation.

Variants and Related Words

• Zenithal (adj): Relating to or located at the zenith.
  • The zenithal position of the star was recorded.
• Nadir (n): The point in the sky directly opposite the zenith; figuratively, the lowest point.
  • This defeat marked the nadir of the team's season.

Synonyms

• Apex: The top or highest part of something.
• Pinnacle: The most successful point; the culmination.
• Acme: The point at which someone or something is best, perfect, or most successful.
• Culmination: The highest or climactic point of something, especially as attained after a long time.
• Peak: The highest point, especially of a mountain or a period of success.

Antonyms

• Nadir: The lowest point.
• Bottom: The lowest point or part.
• Trough: A low point in a process or a period of low activity.

Related Phrases and Idioms

• "To reach its zenith": To achieve its highest point.
  • The movement reached its zenith in the 1960s.
• "Zenith distance" (Astronomy): The angular distance of a celestial body from the zenith.
  • Calculating the zenith distance is essential for navigation.

Noun

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