Events
The first day of autumn, September 22, is not a guarantee of autumn weather, but officially it is the beginning of the season. The season starts on different days in different years for two reasons: in a typical year, the number of days is not even always precisely determined (leap years and non-leap years), and this is not entirely added Earth's circular orbit, as well as the gravity of other planets, which constantly change the direction of our planet relative to the Sun from year to year.
As a result, wise nature has moved the hottest and coldest days of the year two days earlier over the past 150 years.
This year, autumn starts on Tuesday because today is the autumnal equinox. The equinox (marking the beginning of autumn and spring) and the solstice (marking the onset of winter and summer) are the starting points in space and time that indicate the transition of our planet to another a journey around the sun.
At each equinox, the Sun crosses the Earth's Equator, with day and night becoming roughly equal across most of the planet. Being at the equator, the Sun is directly overhead at noon.
The Earth's rotation around its axis and around the Sun is the foundation of all life on the planet, from the time of day and night to the changes of the seasons.
The sun rises every day because the Earth makes one circle around its axis every 24 hours. The change in seasons is the result of the Earth's deviation by 23.5 degrees from its axis, to which is added to the complete rotation around the Sun in 365 days.
At the North Pole, the Sun only rises once a year, in early spring. It rises higher and higher every day until it reaches its highest point on the summer solstice, then begins to gradually fall, leading to autumn at the end of September equinoxes.
On the winter solstice, the Sun moves very low above the earth in the northern hemisphere. This is clearly visible to those who live in the Arctic Circle, and the amount of sunlight on this day is the least of the year. By the time of the spring equinox, the length of the day increases significantly. On the summer solstice, the Sun rises to the highest point in the sky, with the longest day of the year in the northern hemisphere. For another quarter of the way, on the autumnal equinox, the Earth's axis again points neither to the Sun nor to the opposite direction.
Also, at different times of the year, the position of the stars in the sky also changes. Any star fades out 4 minutes earlier at night than the night before. In a month, these 4 minutes turn into 2 hours. In winter, this means that we see stars that were not visible in summer due to their appearance during the daytime, and vice versa. As a result, summer stars, such as the Big Dipper, are only visible in summer.
In summer, our planet is farther from the Sun than in winter, this is due to the fact that the Earth's orbit around the Sun is not circular.