今晚是凸月。
There was a three-quarter moon tonight .
月亮有四种主要的相：新月、半月、凸月和满月。
The moon has four major phases : crescent , half moon , gibbous and full moon .
蛾眉日和凸月的长落时刻，可以用同样的方法估计。
The rise and sets of cresent and gibbous phase can be estimated in the same way .
凸月凸月凸月