By Robert Gardner

Why does not the Moon fall to Earth? Why do the seasons switch? what's parallax? how are you going to simulate weightlessness in the world? younger scientists will discover the sun procedure via utilized area technological know-how answering questions on area. The far-out house experiments during this publication can assist scholars make a version of a lunar eclipse, construct a spectroscope, and extra! Many experiments comprise principles scholars can use for technological know-how reasonable initiatives.

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Slowly move the coin farther from your eye. Does the coin block out more or less of the bulb as you move it away? Hold the coin far enough away so that it blocks the center part of the lightbulb but leaves a ring of light around the edge. This is what happens during what is called an annular eclipse. In an annular eclipse, a thin ring of light is still visible all around the edge of the Sun. You can also move the coin so that it blocks out the top, bottom, or one side of the lightbulb. This is what happens during a partial eclipse when the Sun and Moon are not quite in line with your location on Earth.

When that happens, part of the Sun is visible during the eclipse. Of course, Earth can cast a shadow, too. We enter its shadow every evening after sunset. And we emerge from its shadow every morning at sunrise. Sometimes we can see Earth’s shadow on the Moon. This is called a lunar eclipse because the Moon becomes partially hidden by Earth’s shadow. This can happen when the Sun, Earth, and a full moon all lie along the same line, as shown in Figure 17b. Because Earth’s atmosphere bends some sunlight around Earth, our view of the Moon is never totally blocked by Earth’s shadow.

Tape the plastic wrap firmly to the cardboard and draw the lines on the clear wrap with a felt pen. Take your sky clock outside in the evening and early morning. Practice using it to tell time. Hold it so that its plane is perpendicular to, and its center in line with, Polaris. The numeral 12 directly above April should be at the top of the clock as would be the numeral 12 on a clock in your house. Read the position of the pointer stars of the Big Dipper on your sky clock. Together they form a line representing the hour hand of a clock.

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