On which of the following days will the sun appear on the celestial equator?

On which of the following days will the sun appear on the celestial equator?

Except at the extreme boundaries, the Sun will be at its zenith two days every year, except on June 21 for the Tropic of Cancer and December 21 for the Tropic of Capricorn. For example, during the equinoxes of March 21 and September 22, the Sun will be at its zenith at the Equator.

During a solar eclipse, when does darkness fall over an area of land?

When darkness falls over an area of land during a total solar eclipse, it is called an occultation. The word "occult" means "to hide from view". Darkness falls over part of Earth during a partial solar eclipse, but enough sunlight still reaches the ground to prevent an occultation occurring.

How did scientists discover that the earth revolves around the sun?

Scientists discovered that the earth revolves around the sun by using parhelia. A parhelion is any bright spot on the sky that appears as a mirror image (i.e., polar opposite) of another object. Only in rare cases can parhelia be seen with the unaided eye; usually they must be observed with a telescope. Parhelia were first described by Aristotle and later confirmed by many other philosophers and astronomers.

What is the meaning of life?

That's a hard question to answer! No one has ever been able to give a completely satisfactory answer to this question.

How many times in a year would you find the sun overhead if you lived at a 20-degree north latitude?

The sun will be directly above twice. The first time will be many weeks before the summer solstice, or June 21, when the vertical sun rays migrate north and reach the tropic of Capricorn, which is 23.5 degrees north latitude. From there, they slowly but steadily return south again.

The second time will be after the winter solstice, or December 21, when the rays are once more headed north toward the tropics.

In between these two events, the sun will have moved further south, so it won't be directly over every day in January or July. But since the average distance of the moon from the earth is about 240,000 miles (390,000 km), when the moon is half full it will replace the sun in height above the horizon.

So one lunar month equals about 29.5 days, and the annual cycle repeats itself with two new seasons coming every year as the earth travels through its orbit around the sun.

The length of the solar year depends on how far the earth is from the sun. If it's near its greatest apparent distance from the sun (called perihelion), then the year is about 365.25 days long. If it's close to its least apparent distance (aphelion), then the year is about 354.9 days long.

At what latitude on earth will the sun be directly overhead on the autumnal equinox (Sept. 21)?

The sun is 66.5 degrees from the zenith and 23.5 degrees above the horizon. There are 12 hours of daylight and 12 hours of darkness at the Tropic of Cancer. The sun is 23.5 degrees away from its zenith. At noon on the equinox, the sun is directly above at the equator. It is going down south of the equator and rising north of the equator.

The point on Earth's surface where the sun is exactly over head on the equinox is called the prime vertical. All around this spot, day and night are of equal length because the sun is high in the sky. At the equinox, the plane of Earth's orbit around the sun is tilted by exactly 45 degrees toward the center of our galaxy. As a result, we experience an annual cycle of light and dark at the poles that causes plants to grow and then die back each year. This is why astronomers call this time of year "the fall season."

At the equinox, the only parts of Earth that receive direct sunlight are the far northern and southern hemispheres. Every other part experiences either nocturnal illumination or full-on daytime with the sun being directly above.

With no twilight at the equinox, days and nights are of equal length everywhere on Earth. The only times when this isn't true are during a total solar eclipse or near a polar region.

Where does the sun shine on the second solstice of the year?

The Year's Second Solstice The Sun shines exactly overhead the Tropic of Cancer (latitude 23deg 30' North) in the Northern Hemisphere on the June Solstice, and directly overhead the Tropic of Capricorn (latitude 23deg 30' South) in the Southern Hemisphere on the December Solstice. These are the only times when the entire surface of Earth is illuminated by direct sunlight from the Sun.

At other times of the year, parts of Earth are exposed to sunshine while others are in darkness. On the June Solstice, a portion of Earth is always in darkness because the Sun is straight up in the sky; there is no part of Earth that is receiving direct sunlight. On the December Solstice, all over Earth, people are enjoying a moment of complete solar illumination as far as their eyes can see.

On other days too, portions of Earth are in darkness. For example, during the June Solstice, a portion of Earth is in darkness because there is a piece of land directly between Earth and the Sun called Earth's Moon. During the December Solstice, a different part of Earth is in darkness because there is a large body of water called Earth's Ocean between us and the Sun.

Overall, then, on the June Solstice, the Sun is shining directly overhead on one spot of ground in each hemisphere, but from another spot of ground in each hemisphere it is not visible because it is below the horizon.

What happens to the sun's rays at the equator?

At midday, it is where the sun appears straight overhead. The subsolar point emerges twice a year (during the equinoxes) near the Equator and migrates north and south over the tropics the rest of the year. During the June solstice, the sun's vertical rays touch the Tropic of Cancer, 23.5 degrees north of the Equator. At the December solstice, the sun's vertical rays touch the Tropic of Capricorn, 23.5 degrees south of the Equator.

During most of the year, the Equator is in the middle of the night when the sun is high in the sky. So only the portion of the sun's light that reaches the ground is visible at the Equator. Most of this sunlight passes right through our planet and out into space. But some of it is reflected back toward the moon or earth by clouds or other objects below the surface of the earth.

The part that is reflected gets re-emitted as infrared radiation. Some of this radiation makes its way back down to Earth's surface and becomes visible as heat. This is why places like the Equator have such hot climates. There is much more sunlight falling on the area than there would be if it were not for all of this reflection going on underground.

Reflection from the top of the earth causes problems for astronauts living or working outside during the summer months. Because they are facing upward, they get completely blocked out from view by the sun.

About Article Author

Martha Flock

Martha Flock has always been fascinated with how people are connected to each other through time, space, energy, love or light. After her own personal experiences in life-altering moments led her on a quest to discover more about herself and others in this realm of being human she decided to become an astrologer so that she could help others understand their own journey better.

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