Question

What is the duration of the day on the equinox?

Answer 1

1. On 21st March and 23rd September, both the poles of the earth are at the same distance from the sun.
2. This condition is called the equinox.
3. On the equinox, everywhere on the earth daytime and nighttime are of equal duration (12 hours each).
4. On the equinox, the circle of illumination coincides with the great circle defined by two opposite meridians.