Day and Night in the World | astroEDU
This article talks about the best places on earth to visit where the sun never sets. Don't we all have those days when we wish the day never ends. Well, some people Visit the region and live for days, for there is no night. But the Polar Night was what drew me to Tromsø in the first place. learned that the University of Tromsø is the northernmost university in the world. and frequented Tromsø coffee shops where I would spend the day working . grumble in the U.S., my Norwegian friends would walk or ski to our meet-ups. A terminator or twilight zone is a moving line that divides the daylit side and the dark night side The terminator passes through any point on Earth's surface twice a day, at sunrise and at sunset, apart from polar regions where this only occurs The transition from light to dark takes place on two fronts in this image of Mimas.
Is there a place on earth where night and day meet?
The orientation of the terminator between the northern and southern hemispheres depends on the season. On the spring and fall equinoxes around March and September 21there is no tilt of the Earth with respect to the Sun so the terminator line is parallel with the axis of the Earth and with the lines of longitude. A photograph of part of the terminator crossing the surface of the Earth, as seen from the ISS.
The terminator is diffuse and shows the gradual transition to darkness that is experienced as twilight on the surface. An oblique view of the large lunar crater Keeler at the terminator from Apollo 13 The east side of the Timocharis crater while at the terminator from Apollo 15 The lunar terminator is the division between the illuminated and dark hemispheres of the Moon.
Due to the angle at which sunlight strikes this portion of the Moon, shadows cast by craters and other geological features are elongated, thereby making such features more apparent to the observer. This phenomenon is similar to the lengthening of shadows on Earth when the Sun is low in the sky. For this reason, much lunar photographic study centers on the illuminated area near the lunar terminator, and the resulting shadows, provide accurate descriptions of the terrain.
Lunar terminator illusion[ edit ] The lunar terminator or tilt illusion is an optical illusion arising from the erroneous expectation of an observer on Earth that the direction of sunlight illuminating the Moon i. The cause of the illusion is simply the observer is not taking into account that the observed slope of a light ray will change across the sky because of the lack of visual clues to establish 3D perspective. As the particles within an atmosphere are at a higher elevation, the light source can remain visible even after it has set at ground level.
These particles scatter the light, reflecting some of it to the ground. Hence, the sky can remain illuminated even after the sun has set.
Day and Night in the World
Low Earth orbit satellites take advantage of the fact that certain polar orbits set near the terminator do not suffer from eclipsetherefore their solar cells are continuously lit by sunlight.
Such orbits are called dawn-dusk orbits, a type of Sun-synchronous orbit. Sometimes they have adapted in other ways as well. Nocturnal animals can be recognised by specific features, because they live in the dark. The nocturnal animals in the photographs are the bat, the owl, the hedgehog, and the panther.
Good to know Bats have such poor eyesight that they do not find their prey by looking with their eyes but by emitting ultrasonic sounds.
This sound is reflected from the prey back to their ears. This tells them the distance to their prey. Owls have strikingly large eyes.
This means they can see their prey clearly at night. A panther has eyes with a reflective layer. This enables them to make optimal use of the little light during the night.
Children in the world Give each student a paper square, a pair of scissors, and colouring pencils. Students complete Task 1 on the worksheet. Read the instructions together and look at the example.
Explain that they need to fold the paper into a triangle. They fold this triangle in half, and in half again. At the top of the folded paper they draw a child as shown in the example on the worksheet.
Then they cut this out. Make sure the students only cut the outside of the paper that they do not cut the centre point. The circle in the middle of the paper should remain intact. When the paper is unfolded, the students will see a planet with a group of children holding hands all around it.
Explain that this represents all the children on Earth. Get everyone to colour in two opposite children in two different colours. Explain that one child lives in Europe and the other in Australia. Australia is all the way around the other side of the world.
Terminator (solar) - Wikipedia
Day and night in the world I Give each child an embroidery needle and a split pin. Students complete Task 2 on the worksheet print the cutout sheet on thick paper, instead of A4 paper, to avoid tearing. Ask students not to cut out the small black circle in the middle. The students place the square over the world with the children from Task 1.
They use the embroidery needle to prick a hole in the black circle and a hole in the centre of the world from task 1.
They place the square over the children of the world and fasten the two together with a split pin. Demonstrate how it works. The students see that half of the world is covered by the semi-circle.
Is there a place on earth where night and day meet? | Yahoo Answers
The students turn the uppermost circle around and see that when it is day for the child in Europe it is night in Australia and vice-versa. Ask where it is light when it is dark in Europe. Turn the uppermost circle a little at a time.
Can the children see that it is night at a different place on the planet at each time? If it is day for the child in Europe, what is it for the child in Australia? Use this to make it clear to the students that when it is day for us, it is night on the other side of the world. Light always travels in a straight line.
It is unable to travel around an object.
The Earth turns on its own axis once in every 24 hours, and during this time the Sun only shines on the half of the Earth that is facing the Sun. On the other side of the planet it is then night. So we have day and night because the Earth turns on its own axis. Day and night in the world II Take an orange or a globe. Explain to the students that you are going to stick a sticker or a cocktail stick in it to show Europe and one to show Australia.
Stick a piece of tape on the stick for Europe so you can tell them apart. Take a torch and say this represents the Sun.