Why does seasonal change

The answer is YES. However, you can stand an egg on end, with a large amount of patience, on any day of the year. This idea seems to pop up every year around the equinox. The thought that an egg can only stand on end on the spring equinox due to gravitational forces of the sun being aligned with the earth sounds like science, but it isn't.

According to Chinese tradition, an egg can be made to stand on end at the precise moment winter ends and spring begins. But, the Chinese calendar had this transition occurring at a variable time each year, determined partly by the Chinese lunar month, usually in early February. More recently, this thought became fixed to the time of the spring equinox. The underlying assumption relating to standing eggs on end is that there must exist some special gravitational balance. There are many forces acting on an egg when you try to stand it on end on a flat surface.

Some people think that the gravitational pull of the Sun becomes balanced with that of the Earth to allow for this phenomenon to occur. However, the Moon exerts a much stronger gravitational effect on the Earth than the Sun, dominating the ebb and flow of the ocean tides. The Moon's effects are different at each of the equinoxes however. The most dominant force of gravity on a standing egg is the one between the Earth and the egg itself.

This is determined by the weight of the egg and the force pulling the egg to the counter top. If you want to prove this to yourself, take a fresh, uncooked egg and hold it with the larger end resting on a table or counter top. Wait for the fluid content of the egg to settle, then carefully test the balance.

Be patient as you find the point where you can ever so gently let it go to remain standing on end. Please Contact Us. Please try another search. Multiple locations were found. Earth takes 26, years to complete one precession. What are the effects of precession?

The effects are the timing of the Seasons and changes in the Celestial poles. Precession is not a perfect path; a wobble in the precessional motion called Nutation causes a small irregularity in the precession.

Privacy Policy. Powered by. A season is a period of the year that is distinguished by special climate conditions. The four seasons—spring, summer , fall, and winter —follow one another regularly. Each has its own light, temperature , and weather patterns that repeat yearly. In the Northern Hemisphere , winter generally begins on December 21 or This is the winter solstice , the day of the year with the shortest period of daylight.

Summer begins on June 20 or 21, the summer solstice , which has the most daylight of any day in the year. Spring and fall, or autumn, begin on equinoxes, days that have equal amounts of daylight and darkness. The vernal, or spring, equinox falls on March 20 or 21, and the autumnal equinox is on September 22 or The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere.

This means that in Argentina and Australia, winter begins in June. The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solstice, the longest day of the year, is December 21 or Seasons occur because Earth is tilted on its axis relative to the orbital plane, the invisible, flat disc where most objects in the solar system orbit the sun. Earth rotates around its axis. This means it gets more hours of daylight. In December, when the Northern Hemisphere is tilted away from the sun, with fewer hours of daylight.

Seasons have an enormous influence on vegetation and plant growth. Winter typically has cold weather, little daylight, and limited plant growth. In spring, plants sprout , tree leaves unfurl , and flowers blossom. Summer is the warmest time of the year and has the most daylight, so plants grow quickly.

In autumn, temperatures drop, and many trees lose their leaves. The four-season year is typical only in the mid-latitudes. The mid-latitudes are places that are neither near the poles nor near the Equator. These differing temperatures are also responsible for a lot of our wind. Hot air near the equator rises and moves toward the poles. Heavy, cold air at the poles sinks and moves toward the equator.

This cycle keeps our atmosphere in constant motion. For this activity, you will need a globe and a flashlight. Place the globe on a flat surface. Turn on the flashlight and turn out the lights in the room. Stand about inches cm from the globe and shine the flashlight directly at the equator.