![]() Why? Because we all see the same sky.Įverywhere on Earth, except at the North and South Poles, you have a due east and due west point on your horizon. ![]() It’s true no matter where you live on Earth. That’s because, generally speaking, the sun rises due east and sets due west at the equinoxes. The day of an equinox is a good day for finding the directions due east and due west from your favorite place to watch the sky. The foreground is the city view of Taipei as seen at the location, with the tallest building being Taipei 101, a famous Taipei landmark.” Thank you, Meiying! A good day to find due east and due west They were shot from Septemto Septemfrom the same viewing platform on an eastern hill of Taipei. View at EarthSky Community Photos | Meiying Lee in Taipei, Taiwan, captured this solar analemma during an entire year, from September 2020 to September 2021 (equinox to equinox), and wrote: “This sun analemma photo of Taipei is composed in Startrails by stacking 30 images taken at 4:30PM on different days with sun filter. So these days of approximately equal sunlight and night will change quickly. Of course, Earth never stops moving around the sun. The sun is overhead at noon as seen from the equator. Earth’s two hemispheres are receiving the sun’s rays about equally around equinox time. We have an equinox twice a year – spring and fall – when the tilt of the Earth’s axis and Earth’s orbit around the sun combine in such a way that the axis is inclined neither away from nor toward the sun. And that means Earth’s Northern and Southern Hemispheres trade places throughout the year in receiving the sun’s light and warmth most directly. It’s caused by Earth’s tilt on its axis and ceaseless orbit around the sun. Today, we know each equinox and solstice is an astronomical event. They could easily see that the sun’s path across the sky, the length of daylight, and the location of the sunrise and sunset all shift in a regular way throughout the year. They used the sky as both a clock and a calendar. The earliest humans spent more time outside than we do. Two factors cause more day than night at an equinox. But that doesn’t mean that day and night are exactly equal in length. Read: Why aren’t day and night exactly equal on the equinox? Around the time of an equinox, Earth’s Northern and Southern Hemispheres are receiving the sun’s rays equally. The name equinox comes from the Latin aequus (equal) and nox (night). For everyone across the globe, days and nights are approximately equal in length. Note: On this equinox, the sun crosses above Earth’s equator, moving from north to south. CDT on September 22 for central North America translate UTC to your time). When is the next one? The next September equinox will fall at 1:04 UTC Septem(8:04 p.m. What is it? The September equinox marks the sun’s crossing above Earth’s equator, moving from north to south. Meanwhile, south of the equator, spring begins. Read more about these images, which are via NASA Earth Observatory.įor us in the Northern Hemisphere, the sun is rising later now, and nightfall comes sooner. From left to right, a June solstice, a September equinox, a December solstice, a March equinox. Satellite views of Earth on the solstices and equinoxes.
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