equilux
noun [ C or U ] physics specialized uk/ˈek.wɪ.lʌks/ us/ˈek.wə.lʌks/
昼夜平分日
a date when day and night are of exactly equal length
The date of the equilux will vary depending on where on Earth you are, whereas the equinox is a fixed instant in time. 昼夜平分点的日期取决于你在地球上所处的位置，而昼夜平分点是一个固定的时间瞬间。
Compare: equinox
- More examples
- In New York City, “equilux” will be September 25, when both sunrise and sunset are scheduled for 6:47.
- The days on which the length of day and night are exactly equal, called the equilux, occur a few days before the spring equinox and a few days after the autumn equinox.
- Even on the days of equilux, the sky will be bright for some time before the first rays of the Sun hit, and remain bright for some time after it sets. This time of day is called twilight.
- Equiluxes do not occur at all close to the equator.