![]() ![]() In the northern hemisphere, the spring equinox cues the beginning of spring around 20 March. The spring equinox (vernal equinox) is the time of moving from winter to summer. The two equinoxes are called the spring equinox and the autumn equinoxes. In the calendar, the equinoxes occur roughly around 20 March and 22-23 September. The Equinox defines the transition of the seasons. That’s two times (biannual) a year on two days that earth’s tilt moves once from northern to southern summer, then back again. And then again as the southern hemisphere begins its winter. It marks the time the northern hemisphere moves into winter. The equinox is when the day-night line (dividing line between daytime and nighttime) passes precisely through the north and south pole on the planet. As it moves through the seasons the hemispheres will have shorter or longer periods of time. The exact line that determines day-night is called the terminator line. The entire planet experiences days that are the same length of time. They occur twice a year when the sun is directly above the equator (which is the middle line or widest part of planet earth). Both the northern and southern hemisphere have the same length of day. The equinox is the time in the year where the day and night are equal. It is defined by the two equinoxes and two solstices. ![]() The tilt of the earth’s axis determines the seasons. It’s this moment that the equinox occurs, the period where both the northern and southern hemisphere experience an equal amount of sunlight, and hence day length. That’s when the northern hemisphere begins its transition into winter.įrom now, the southern hemisphere begins to tilt towards the sun. Eventually, the middle of the earth, or the equator points at the sun. ![]() After it tilts directly towards, it slowly tilts away. How does the Northern Hemisphere summer transfer to summer in the southern hemisphere?ĭuring the northern summer season, the tilt of the earth is pointed towards the sun. It happens as the hemisphere is exposed to less amount of sunlight due to the tilt of the earth’s poles. Then the days get shorter and nights longer as it transitions into winter. Summer has the longest days and winter has the shortest days.ĭuring the summer season, the days get longer and nights get shorter. How does the length of day change with season?ĭuring the change of four seasons length of days change. Spring is when the pole begins to point toward the sun again. Winter then happens as the pole is pointed away from the sun. Then autumn is when the axis begins to tilt away from the sun. The days are longer days and shorter nights for three months of the year. It takes 12 months for the earth to pass through a full cycle of tipping from north to south pole towards the sun.Īs the north or south poles tilt towards the sun, it puts that hemisphere in summer. As the earth revolves around the sun, it is tilted, so the north or south pole tip towards the sun. The four seasons happen by a tilt in the earth’s poles towards or away from the sun. If you are in the other hemisphere, you are in the opposite season. If you are in one hemisphere, you are in one season. It’s the middle line which marks the largest distance around the earth. The two sides of the planet are divided into the Northern and Southern Hemisphere. They happen because of the tilt of the earth towards or away from the sun.īefore we understand them, we need to think of how the seasons happen. The solstice and equinoxes are times that the season changes. The solstice and equinoxes define seasons Let’s explore the solstice vs equinox days in the calendar. The equinox and solstices mark four key times in the yearly calendar that you may not be aware of. With the seasonal change, there are significant astronomical markers of earth’s position with the sun. In modern life, it’s easy to forget the yearly calendar relates to the movement the planet through the solar system. All systems on earth depend on the four seasons of our planet. For humans, the seasons and earth’s rotation around the sun is the basis of why we are alive. ![]()
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