Activities: Observations
Navigating the Night Sky
困难: ★
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Equatorial Sundial
困难: ★
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Light pollution, an introduction to astronomy/environmental education
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Light pollution
困难: ★
Working before observations
困难: ★
Observation of variable stars
困难: ★
Determining longitude and latitude
困难: ★
Where Are You? Locating by the Sun
困难: ★
Studies on the Shadow of an Obelisk Used as Horizontal Sundial
困难: ★
Measuring the diameter of the Sun
困难: ★
Observations with a Pinhole Camera
困难: ★
Let us measure the excentricity of the terrestrial orbit
困难: ★
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Let us observe the daily path of the Sun
困难: ★