The Earth's tilt angle, 23.5°, prevents an equal and simultaneous distribution of the sun on both hemispheres. However, a phenomenon occurring twice during the year, in March and September, allows an equal orientation of our two hemispheres facing the sun, it is an equinox. This is what Cosmic Trip Equinox shows.
 Crossing the equatorial plane of the Earth, the sun illuminates equally the two hemispheres of our planet, we then change celestial hemisphere. The North and South poles then receive the same amount of light, and the time that the day lasts is the same as the time that the night lasts.