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| Distance |
| What is parallax? Find out how astronomers use parallax to measure the distance to nearby stars. Discover how to measure the distance to stars that are too far away for parallax to be observed.
Explore other properties of stars, such as energy and light, and learn what these properties can tell us about how far away a star is from Earth. Topics include:
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| Trigonometry |
| Explore the basic properties of right triangles. Learn how to determine distances that cannot be measured directly and how astronomers use trigonometry to determine the distance to nearby stars.
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| Angles |
| Learn about types of angles and how to measure angles. Discover how angles are used to determine latitude and longitude by the position of the North Star. Learn how angles are used in finding coordinates of latitude and longitude to help us pinpoint locations on the surface of the Earth. Discover the role the earth and sun play in seasonal change. Read about the ancient Greeks and their mythological explanation of seasonal change.
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| Graphs |
| Learn about the properties of a coordinate system, how to plot coordinates to create a map and how the coordinates of longitude and latitude correspond to right ascension and declination, the coordinates used to locate stars.
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| Motion |
| Explore different types of motion and the effects these motions have on the phenomena that can be observed. Types of motion include linear, rotary, and oscillatory. Study Newton's 1st law of motion and the relationship between velocity, speed, and acceleration. Learn about the Coriolis force, movements of the Earth and sun, and stories relating to the vernal equinox.
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| Star Charts |
| Learn about many of the major constellations and the Greek myths that are related to each one. Learn where to look for each constellation in the night sky. Discover how to use constellations as guideposts for observing the motion of the sun, planets, and even comets throughout the year. Other topics covered include retrograde motion, the ecliptic and the sun, and Venus as the evening and morning star.
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| Scientific Notation |
| Learn how to use scientific notation to manipulate very large numbers. Astronomers are confronted with very large numbers and scientific notation serves as a convenient way to express large numbers.
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