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Procession of the Equinox
Because Earths axis is tilted.
The axis
No
Mercury
Because it tilts on its axis
It is caused by the earths tilt on its axis.
The axis of the Earth is tilted 23.5 degress from the plane of the orbit round the sun.
The passage of the sun across the sky during daylight, and the stars circling round the axis during darkness.
Procession of the Equinox
Because Earths axis is tilted.
intersect
The axis
The earth moves in a circular fashion, which is a left to right movement. It also moves on its axis, which helps keep it rotation and gravity pull well balanced. Just one slight move of the axis and the earth will go hurling in space.
1. Tilt of earths axis 2. Earths axis remains parallel throughout its yearly orbit.
The name of the path a planet occupies in its movement around the Sun is called an orbit. The shape of the path is an ellipse, with the Sun at the focus. Due to the inverse-square rule of gravity, the speed of movement is greater in orbits closer to the sun, slower for more distant orbits.
Seasons