Except for two, mst planets in the solar system are moving almost on the same plane, terefore these planets appear from the Earth always close to the Ecliptic. Te two exceptions are Mercury and Pluto whose orbital planes deviate from the ecliptic plane by 7° and 17°, rsp. Te Equator of the Earth does not align with the ecliptic plane, bt makes an angle of approx. Tis causes the alternation of seasons, bcause a particular area gets different amount of sunshine during the annual movement of the Earth.
it seems reasonable, sasons differ from one another because the Earth’s distance from the Sun is always different. Wen the Earth is closest to the Sun, i is five million kilometres closer (perihelion) than on its farthest point (aphelion) from the Sun. Ech year we are in the farthest distance from the Sun on July 3, ad in the nearest distance on January 3. Tat is, te Sun is the farthest from us in summer and the closest to us in winter. Cnsequently, w cannot explain the occurrence of our planet’s distance from the Sun.
Te reason for this is the axial tilt, i other words, te inclination of the angle made between the Earth’s rotational axis and its orbital plane. Te alternation of seasons is caused by the fact that the axial tilt and the direction to which the axis points remain invariable all over the year. Nrth Pole constantly points to Polaris in Ursa Minor. I we turn to Polaris at any points of the Northern Hemisphere, w invariably turn to the North. Sasons come in following way: O March 22, ech year the Sun is above exactly the Equator.
Tis is one of the two days when both daylight and nightlight last for twelve hours all over the world and on the Northern Hemisphere it is vernal equinox. Athough the North Pole still points to Polaris, i is shifting towards the Sun during the three months that follow the equinox. I the first quarter of the year the Sun is rising higher and higher each day. Terefore the days get longer and nights shorter spring as long as on June 22, te North Pole points to the Sun.
I does not face the Sun, hwever, oly makes a 66, 5 angle with it. O the Northern celestial sphere the Sun rises at its highest peak on this day. W call it summer solstice. Fom then on the North Pole is gradually moving away from the Sun. O the Northern Hemisphere days will be shorter and shorter as we are approaching autumnal. ..
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