Earth experiences an equinox when the day and night are of equal length everywhere on the planet. Does Uranus experience an equinox? If so, how often? (The orbital period of Uranus is 84 years.)
A) No.
B) Yes, every 6 months just like Earth.
C) Yes, every 42 years.
D) Yes, every 84 years.

Question

Quizplus · Accepted Answer

Uranus experiences an equinox every 42 years because its extreme axial tilt causes each pole to point directly at the Sun once per Uranian year, which lasts 84 years. Thus, equinoxes, when day and night are of equal length everywhere on the planet, occur twice per Uranian year, or every 42 years.

Earth Experiences an Equinox When the Day and Night Are