Definition

1. Noun:
   • First Quarter (of the moon): The specific lunar phase when the moon is exactly half-illuminated as seen from Earth, and the illuminated portion is increasing. This occurs approximately on the 7th or 8th day of the lunar month.

Usage Examples

• Noun:
  • Trời đêm có trăng thượng huyền. (The night sky has a first quarter moon.)
  • Theo lịch âm, hôm nay là ngày thượng huyền. (According to the lunar calendar, today is the day of the first quarter.)

Advanced Usage

• The term "thượng huyền" is part of a pair with "hạ huyền" (last quarter), describing the two half-moon phases. "Thượng" (upper) refers to the moon's position and its waxing (increasing) state in the first half of the lunar cycle.

Variants and Related Words

• Trăng thượng huyền (n): First quarter moon.
  • Ánh sáng của trăng thượng huyền rất dịu. (The light of the first quarter moon is very gentle.)
• Hạ huyền (n): Last quarter (of the moon).
• Trăng non (n): New moon.
• Trăng tròn (n): Full moon.

Synonyms

• First quarter
• Waxing half-moon

Related Concepts

• Lunar phase: A distinct stage in the moon's monthly cycle of appearance.
• Waxing moon: The period when the moon's illuminated area is increasing, from new moon to full moon. "Thượng huyền" is the precise midpoint of this waxing period.