When Is The Longest Day In The Northern Hemisphere


When Is The Longest Day In The Northern Hemisphere – When I ask someone, “How was your day?”, they often say, “It was long.” Sometimes, if it’s been a really rough day, they’ll go so far as to claim it felt like “the longest day of the year.” On most days, 364 to be exact, that claim is factually false. Today, however, anyone in the Northern Hemisphere can rightly say that this feels like the longest day of the year.

That’s because today is the summer solstice, which means the Earth is tilted directly toward the Sun today. In other words, since the Earth’s axis of rotation (the top around which the Earth spins) is not perpendicular to the plane of its orbit (the elliptical one formed by its annual ring around the Sun), the Earth spends half the year tilted. towards the Sun, and half the year tilted away from it. Today, the tilt of the Northern Hemisphere is directed directly towards the Sun. As a result, the Northern Hemisphere experiences its longest day of the year.

When Is The Longest Day In The Northern Hemisphere

When Is The Longest Day In The Northern Hemisphere

The Earth always tilts in the same direction as it orbits the Sun. As a result, the northern hemisphere faces the sun more directly during half the year, and the southern hemisphere faces more directly during the second half of the year. This causes the seasons, solstices and equinoxes. This is also the reason why days have different lengths. Image: PeterHermesFurian/iStock/Thinkstock

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It all started about 4.51 billion years ago when an asteroid named Theia collided with the molten mass that was our little Earth. While the exact details of the collision are still debated, scientists agree that the impact created our moon and left Earth with its axis of rotation tilted 23.5° to the side. One consequence of this planetary fender-bender was the four seasons. They occur according to the same logic as the solstice.

When the Northern Hemisphere is tilted toward the Sun, sunlight has less atmosphere to pass through on its way to Earth, so the Northern Hemisphere absorbs more energy. This raises the temperature and 3 months of summer is experienced everywhere north of the equator. At the same time, the southern hemisphere is tilted away from the Sun and therefore absorbs less energy. Therefore, places below the equator are experiencing winter right now.

Fast forward 6 months and this changes. The Northern Hemisphere will receive less sunlight, less energy and therefore will experience winter. Meanwhile, the southern hemisphere will be more exposed to the sun’s rays and experience its summer after that.

The amount of daylight you experience during the solstice depends on your latitude (your distance from the equator). It will be completely dark today for the penguins in Antarctica. It will be sunny all day today for the polar bears around the North Pole! How many hours of daylight do you have today? Image: PeterHermesFurian/iStock/Thinkstock

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So the unique tilt of our planet causes us to experience four distinct seasons. Summer when the hemisphere tilts towards the Sun; fall when it has rounded 90°; winter, when the hemisphere tilts away from the Sun; and spring when rotated another 90°. A complete cycle takes just over 365 days, which causes variations in daylight that make some days, like today, longer than others!

With that in mind, it’s worth considering what the Earth might look like without seasons and different day lengths. This could be the case if the 4.51 billion year old celestial collision never happened. Some researchers believe that the Earth may have retained a sharper axial tilt angle, like Mercury’s, which is only 2.11°. The result would be a permanent consistent amount of daylight, barely recognizable seasons (if any) and a very diverse web of life.

Mercury, the planet closest to the Sun, has a very small axial tilt angle. As a result, the ‘days’ are always of equal length and there is no seasonal variation in the climate. This is one of the many reasons why life forms like those on Earth could never exist on Mercury. Image: FlashMyPixel/iStock/Thinkstock

When Is The Longest Day In The Northern Hemisphere

This is because the ancestors of every living organism on Earth evolved under specific conditions in a specific environment. If these conditions were different, the impact on the environment would be different, and life on Earth would not look like it does today. However, this presupposes that life would have emerged at all, because without a near-perfect climate on our current Earth, there is no certainty that this would happen.

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Where exactly the hereditary information in each living cell comes from is still unknown, but many scientists believe that the first DNA arose because of the exact conditions that were present on the early Earth. If the Earth’s tilt were not 23.5°, its environment would be significantly different, and it is possible that life as we know it may never have begun. Image: cosmin4000/iStock/Thinkstock

Of course, this is all speculation, but its value lies in giving us the gift of gratitude. One of the best things that science does is that it allows us to see the world through new eyes, to be amazed by everything, and to appreciate our existence as the miracle that it truly is. In this case, understanding how and why day lengths and seasons differ can help us appreciate all days, whether long or short.

If you need more reasons to be thankful, today is also an international day of celebration, with festivals taking place across the northern hemisphere to celebrate the summer solstice. In New York, June 21

Is a day full of music, with hundreds of free music concerts taking place across the city from sunrise to sunset. In Norway, they celebrate the start of summer with Slinningsbålet, a flame festival that broke the world record for the “biggest bonfire” in 2016.

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Whether you’re celebrating today by swinging, sitting by the fire, or just taking a few extra minutes to get some extra sun, you’ll be sure to appreciate it! In the words of Olympic sprinter Wilma Rudolf: “When the sun shines, I can do anything; no mountain is too high, no problem too difficult to overcome.”

Barboni, Melanie, Patrick Boehnke, Brenhin Keller, Isaac E. Kohl, Blair Schoene, Edward D. Young, and Kevin D. McKeegan. “Early Moon Formation 4.51 Billion Years Ago.”

Matthew Williams is a science writing intern at the Smithsonian Science Education Center, where he helps create content on all kinds of science topics. He is also a senior at the University of Notre Dame, where he studies anthropology and evolution. He taught high school biology in Ghana and studied sexual selection in the Galapagos Islands. Matthew seeks to contribute to the popular understanding of how humans came to be, to help envision the most sustainable ways in which we can co-exist with all of Earth’s biodiversity. His writing can also be found on the Huffington Post. There are two solstices each year: one in June and one in December. The June solstice marks the longest day north of the equator and the shortest day south.

When Is The Longest Day In The Northern Hemisphere

The June solstice is the moment when the Sun is directly above the Tropic of Cancer in the Northern Hemisphere. This is the northernmost latitude it reaches during the year. After the solstice, it moves south again.

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As the Northern Hemisphere is tilted towards the Sun in June, it receives more sunlight during the day. The tilt of the North Pole towards the Sun is greatest at the time of the solstice, so this event marks the longest day of the year north of the equator.

This effect is greatest at locations far from the equator. In the tropics, the longest day is only slightly longer than 12 hours; in the temperate zone it is significantly longer; and places within the Arctic Circle experience the midnight sun or polar day, where the sun does not set at night.

Conversely, the day of the June solstice is the shortest day of the year in the Southern Hemisphere. Here, too, the effect is greater the further the location is from the equator.

During the year, the subsolar point – the point on the Earth’s surface directly below the Sun – slowly moves along the north-south axis. After reaching its southernmost point at the December solstice, it stops and begins to move northward until it crosses the equator on the March equinox. At the June solstice, which marks the northernmost point on the journey, it stops again to head back south.

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Originally, the name came from the observation that the Sun’s apparent path across the sky changes slightly from day to day, caused by the same process as the movement of the subsolar spot described above.

In the months leading up to the June solstice, the positions of sunrise and sunset creep northward. On the day of the solstice, it reaches its northernmost point. After that, the sun’s daily path across the sky begins to creep south again.

The subsolar point moves north and south during the year because the Earth’s axis is tilted at an angle of about 23.4° to the ecliptic, the imaginary plane created by the Earth’s orbit around the Sun. In June, the northern

When Is The Longest Day In The Northern Hemisphere

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