Teaching Astronomy

During the 19th century, the astronomy of the solar system was taught by mechanical instruments such as this orrery. The complex gearing of the machine is operated by a crank handle, which ensures that each planet completes its solar orbit relative to the other planets. The planets are roughly to a scale of 50,000 miles (80,500 km) to 1 in (3 cm), except for the Sun, which would need to be 17 in (43 cm) in diameter for the model to be accurate.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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