noctambulist ambulance noct-night
a person who walks while asleep
n.梦游者

noctilucent luc Lucy 光
Luminous at night. Used especially of certain high clouds.
adj. 夜间发光的, 黑暗中发光的, 夜间可见的

nocturne
A painting of a night scene.
An instrumental composition of a pensive, dreamy mood, especially one for the piano.
n. 夜曲；夜景；夜景画

nocturnal
Of, relating to, or occurring in the night: nocturnal stillness.
Botany. Having flowers that open during the night.
Zoology. Most active at night
adj. 夜的；夜曲的；夜间发生的；夜间活动的

例句：
The owl is a nocturnal bird.
猫头鹰是夜间活动的鸟。

diurnal diary
Relating to or occurring in a 24-hour period; daily.
Occurring or active during the daytime rather than at night: diurnal animals.
Botany. Opening during daylight hours and closing at night.
A book containing all the offices for the daily canonical hours of prayer except matins.
adj. 白天的；每日的，一日间的
n. 日记账；日报，日刊

equinox equal-equ+i+nox-noks-night
Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator.
Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.
n. 昼夜平分时, 春[秋]分;【天】二分点：在天球上天赤道与黄道相切的两点中的任一点

equinoctial
Relating to an equinox.
Relating to the celestial equator.
A violent storm of wind and rain occurring at or near the time of the equinox.
adj. 昼夜平分的；春分或秋分时的；赤道的
n. 赤道；春分或秋分时的暴风雨