The Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbital plane around the Sun. As the Earth orbits the Sun, its axial tilt causes the amount of sunlight that reaches the planet to vary throughout the year. This variation in sunlight leads to the changing seasons.
If you are a gardener, a farmer, a utility company planner, or a public health official, the astronomical seasons are frustrating. Why? Because by the time the winter solstice arrives on December 21, it has already been cold for weeks. Conversely, by the summer solstice on June 21, the hottest weather is often still a month away (due to seasonal lag). when do the four seasons start and end
You might notice that the astronomical start dates can shift by a day or two each year. This happens because a solar year (the time it takes for Earth to orbit the sun) is actually about 365.24 days, not a perfect 365. Our leap year system corrects this, but it causes the exact timing of the equinoxes and solstices to wobble slightly on the calendar. The Earth's axis is tilted at an angle of approximately 23