Question

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instructions
earth and the other planets revolve around the sun.
planetary orbits are not perfectly circular, but elliptical.
accurate predictions require measurements from the same location over a long time period.
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Explanation:

1. The idea that accurate predictions need long-term measurements from the same location is linked to Tycho Brahe's work (late 16th century), who built an observatory for consistent data.
2. The heliocentric model (planets orbit the Sun) was proposed by Nicolaus Copernicus in 1543, after Brahe's foundational measurements but before Kepler's laws.
3. Johannes Kepler derived elliptical orbits (1609-1619) using Brahe's data, refining the heliocentric model.

Answer:

1. Accurate predictions require measurements from the same location over a long time period.
2. Earth and the other planets revolve around the Sun.
3. Planetary orbits are not perfectly circular, but elliptical.