The moon is in its first quarter.

月亮正处于上弦。

《牛津词典》

This picture of a first quarter Moon was recorded at 23:45 UT on February 22nd from Stuttgart, Germany.

这张上弦月照片拍摄于德国斯图加特，世界时二月22日23：45。

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Today is the day of the first quarter moon.

今天是月亮出现四分之一的日子。

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The Waxing Gibbous Moon - the lunar phase between first quarter Moon and a full Moon - will be approximately one degree south of Jupiter appearing to be only a pen width apart.

ENGADGET: PSA: Slooh's Space Camera broadcasting Moon / Jupiter conjunction right now