How did Hipparchus discover the wobble of Earth’s axis, known as precession?

Suppose you read in the newspaper that one of the planets will be very bright in the night sky because it will be closer to Earth than usual. The newspaper indicates that the planet will be above the horizon to the East at 10:00 P.M. Explain how you could distinguish the planet from surrounding stars. Describe any diagrams, charts, or photographs you might use to prove which point of light was the planet. Justify your method of proof.

Explain the advantages and disadvantages of using nuclear power to produce electricity to power the instruments on spacecraft.