Julien Rouger

From March equinox to December solstice March equinox ▶ the Sun leaves the ecliptic sector of Pisces and enters Aries. It is then vertical to the Earth’s equator. ▶ everywhere on Earth, the Sun rises in the east and sets in the west, while the lengths of days and nights are practically equal (12 hours each). ▶ throughout the northern hemisphere it is the time of the year when the days (...)

The ecliptic and the constellations The ecliptic is the apparent trajectory described each year by the Sun around the Earth. By definition, the Sun is always exactly on the ecliptic. However, the Sun occupies different positions north or south of the Earth’s equator, depending on the time of year. The equinoxes correlate with the moment when the Sun is in the plane of the Earth’s equator. The (...)

These ten videos represent the geocentric cycles of the Sun, the Moon and the planets. The ecliptic is the plane of the Sun’s apparent orbit around the Earth. The trajectories of the Moon and the planets are carried out on orbits more or less inclined on the ecliptic plane. In this ecliptic frame of reference, a planet is thus characterized by two coordinates: its ecliptic longitude (...)