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

noctilucent luc Lucy 光
Luminous at night. Used especially of certain high clouds.
adj. 夜間發光的, 黑暗中發光的, 夜間可見的

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；夜景畫

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；夜間發生的；夜間活動的

例句：
The owl is a nocturnal bird.
貓頭鷹是夜間活動的鳥。

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，一日間的
n. 日記賬；日報，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. 晝夜平分時, 春[秋]分;【天】二分點：在天球上天赤道與黃道相切的兩點中的任一點

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. 晝夜平分的；春分或秋分時的；赤道的
n. 赤道；春分或秋分時的暴風雨