Answer:
d. Equinox
Step-by-step explanation:
A certain day in spring and autumn where the amount of daytime hours and nighttime hours are the same is called equinox.
Equinox occurs twice in a year on March 20 and September 23rd.
- During an equinox, the south and north hemisphere of the earth are receiving equal amount of sunlight.
- The opposite of equinox is solstice in which the duration of light is unequal.
- The equator is the only great circle that is a line of latitude.