Two days, the Equinoxes. Equinox is derived from the latin words for "equal" and "night", and there are two of them a year, the Autumnal Equinox and the Vernal Equinox.
Twice, at the Summer and Winter Solstaces.
Days and nights are only of equal duration twice per year. It occurs on the summer solstice and the winter solstice. The summer solstice occurs around June 20, it can vary from year to year. It signals the start of summer. The winter solstice occurs around December 20, and can also vary from year to year. It signals the start of winter.
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
No. A Joule is equal to a Watt times a second.
117,649
That happens twice, at the "equinoxes".
Twice, at the Summer and Winter Solstaces.
3 Twice. On the Autumnal equinox and on the Vernal equinox.
Twice a year (it happens on one day in spring and on one day in autumn).
Two times
The equator is where the sun is perpendicular (at a 90o angle, not parallel) to the earth at the vernal equinox and the autumnal equinox, the two times during the year when day and night are of equal duration.
It is called the "Equinox Period".
equiNOx or equiNOxes?
The duration of Good Times is 1440.0 seconds.
The duration of Testing Times is 1800.0 seconds.
The duration of Peeping Times is 3000.0 seconds.
The duration of Three Times is 2 hours.