The Earth orbits the sun once every days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not its orbiting around the sun. Students are often interested and highly motivated to learn about ideas about space and care must be taken to avoid the overuse of library and internet sources and to ensure that students are engaged and thinking about secondary sources of information.
Students should be encouraged to make use of observable features of astronomy. These observations can be made during the day as well as at night.
They should then be guided to develop their own questions to research and explore. In this way the research is more directed and not simply a fact finding exercise. Opportunities to make models and to manipulate the models to help students explain their ideas should be provided. The manipulation of models also assists students to view the motion of the sun, Earth and the moon from a new perspective of an observer of the whole system as opposed to their usual perspective as an observer on a very small region on the surface of the Earth.
This can be used as a starting point to challenge existing ideas and to explore new ideas. It is more useful for them to set their clocks by when the sun will be visible where they live than when it will be visible in London.
Most time zones are set as an exact number of hours ahead of or behind the time in London. Most countries prefer to be in only one time zone. That way all the schools and offices open and close at the same time and nobody gets confused. The USA is so big that it is in several time zones. On the far side of the world from Greenwich is the International Date Line. On the western side of the line the time is 12 hours ahead of London and on the eastern side of the line the time is 12 hours behind London.
This means that on the western side of the line it is one day later than on the eastern side of the line. Sometimes we change the time of the clocks so that we can make more use of the hours of daylight.
If we used the same time all year around in Britain then, in the summer, the sun would rise at am and set at pm. Not many people are awake at am, but lots of people are awake after pm.
We set our clocks forward one hour in the spring so that the sun rises at am and sets at pm and we set them back one hour in the winter. This is called summer time. Find out where it is daytime and where it is nighttime right now. Colour in some pictures of nocturnal animals. Try lots of different seasons games. Play a day and night simulation game.
Spot animals in the dark in Night Light, an interactive game. Make your own paper sundial. Complete a World Day and Night Workshop online to understand more about day and night.
Need help? How to videos Why join? Day and night. What are day and night? It takes 24 hours for the Earth to turn all the way around rotation. Every location on Earth experiences an average of 12 hours of light per day but the actual number of hours of daylight on any particular day of the year varies from place to place.
Locations around Earth's equator only receive about 12 hours of light each day. In contrast, the north pole receives 24 hours of daylight for a few months in the summer and total darkness for months in the winter. These two annual times of light and dark are separated by a long sunrise and a long sunset. Earth rotates on its axis; this causes us to experience day and night. But Earth's axis is tilted As Earth orbits our Sun, the axis points toward the same location in space — almost directly toward Polaris, the North Star.
This means that during Earth's movement around our Sun each year, our polar regions spend loooooooong periods pointed toward our Sun in the summer for example, July in the northern hemisphere, or December in the southern hemisphere and long periods pointed away from our Sun during the winter.
At latitudes greater than Because of this tilt and Earth's movement around our Sun, there is a time when Earth's north pole is tilting This is the summer solstice, the first day of the northern hemisphere summer and the longest day of the year in the northern hemisphere. On December 21 or 22, Earth's north pole is tilting This is the winter solstice, the shortest day of the year in the northern hemisphere.
Use the marks as guide. The barbecue stick represents the line about which the Earth spins or rotates. Take the two pieces of straws. Insert them over each end of the axis piercing the styrofoam ball. Make sure that they cover the barbecue stick entirely. Take the illustration board and investigate. The number written on it degrees, symbolized as O is a measure of the tilt of the Earth. Stick the two ends of the straw along this axis using the tape.
Fold the flap to make the stand. The Earth should turn freely when you try to rotate it. You are almost done. Put the Philippine flag in place and also the Brazil flag opposite it. Make the room completely dark. The flashlight should not move.
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