Definition

1. Noun (Astronomy):

   • Culmination: The highest point reached by a celestial body in its apparent daily path across the sky; the moment when it crosses the observer's meridian.

2. Noun (Literary / Archaic):

   • Mid-heaven: The middle of the sky; the firmament. This is an older, poetic term.

Usage Examples

• Noun (Astronomy):
  • Các nhà thiên văn quan sát sao tại thời điểm trung thiên. (Astronomers observe the star at the moment of culmination.)
• Noun (Literary):
  • Con chim bay lên trung thiên. (The bird flies up to mid-heaven.)

Advanced Usage

• This term is highly specialized in modern use, primarily found in astronomical contexts or classical Vietnamese literature. Its everyday usage is very rare.

Variants and Related Words

• Thiên đỉnh (n): Zenith. This is a more common modern synonym for the astronomical concept of the highest point in the sky.
  • Mặt Trời lên thiên đỉnh. (The Sun reaches its zenith.)

Synonyms

• Culmination (Astronomy).
• Meridian passage (Astronomy).
• Mid-heaven (Literary).
• Zenith (closely related concept).

Notes on Usage

• "Trung thiên" is a formal and technical term. For the common concept of the "middle of the sky," phrases like "giữa bầu trời" or "trên trời" are used in contemporary Vietnamese.
• In astronomy, "thiên đỉnh" (zenith) is often preferred for the highest point, while "trung thiên" specifically refers to the event of crossing the meridian.