The axis of the earth is titled at an angel of 66 1/2° from the orbital plane. The earth maintains this tilt throughout it's revolution. This is known as the parallelism of the Earth's axis.
Aphelion - The day on which the Sun and the Earth are farthest is known as Aphelion. It is on 4th July
Perihelion - The day on which the Sun and the earth are nearest is known as perihelion. It is on 3rd January.
