zenith

/ˈzɛnɪθ/
noun
  1. The highest point or peak of something, such as success, power, or development.
    • The Roman Empire was at its zenith around 117 AD.
    • After years of hard work, the company finally reached its zenith in global sales.
    • Her career reached its zenith when she won the Nobel Prize.
  2. The point in the sky directly above a person or place.
    • The astronomer pointed the telescope toward the zenith to observe the stars.
    • From the mountaintop, the moon appeared almost at the zenith.
    • At noon, the sun is near its zenith in the sky.