上じょう弦げん

noun

first quarter moon; waxing half-moon

Astronomical term for the moon phase when the right half is illuminated in the northern hemisphere. Often contrasted with 下弦 (last quarter).

See also: 下弦

• 今こん夜やは上じょう弦げんの月つきが見みえる。

  Tonight we can see the first quarter moon.