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Astronomy books
During the 3rd century, astronomers used shadows in wells to determine the Earth’s radius. Since then, we’ve taken a great interest in our planet and the universe around us–developing equations that give us somewhat of an understanding of the cosmos around us. Most of our findings have been conveniently published in astronomy books.
Some of the other information available in astronomy books includes:
• Average orbital speeds of the planets
• Gravitational force of each planet
• A planet’s mass
• Density
• Different temperatureEarth’s mass was discovered using theories by Newton, Galileo, Henry Cavendish and Eratosthenes. By combining Newton’s Law of Gravity (F=GmM/r2) and his Law of Motion (F=ma), we’ve discovered that the mass of Earth is 6.0 x 10^24 kg, a fact readily accessible in any astronomy book.
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