Before the telescopes was invented, all astronomy was done with the naked eye. However, there were some instruments to help astronomers when they studied the sky.
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• observation were built to study the sky. This stone-built observatory in India was designed to help people measure the movements of stars and planets, and foretell eclipse.
• Quadrant and sextants were instruments that enabled astronomers to work out the position of stars and planets.
An astronomer working out a star's position in the sky by reading the degrees marked on a quadrant.