An equinox occurs on which two dates each year?

1. An equinox is the moment when day and night are of equal length everywhere. 2. This happens twice a year, as the Earth revolves around the Sun. 3. Those two moments fall on 21 March and 23 September. 4. They are effects of the Earth's revolution, along with perihelion and aphelion. 5. Sunrise and sunset, by contrast, result from the Earth's rotation on its own axis. _Source: NECTA CSEE 2023 Geography 013, Question 1: Multiple Choice Questions, item (i)_