Match the word with its definition. part a1 . kepler's 1st law of planetary motion 2 . ptolemaic system 3 . geocentric system 4 . heliocentric system 5 . copernican system part ba. a geocentric system b. the system of planets in circular orbits around the sun. c. planets orbit the sun in elliptical orbits with the sun at one focus. d. the system of the planets and sun in orbit around the earth. e. a heliocentric system

1- Option (C)

2- Option (D)

3- Option (A)

4- Option (E)

5- Option (B)

Explanation:

Kepler's 1st law of motion-  According to the first law, all the planets that exist in our solar system revolve around the sun maintaining an elliptical path. These orbital paths are not circular in shape. According to the Ptolemaic system, the earth is considered to be fixed and is present at the center of the universe, and the Sun, planets, and other planets orbits around the earth. This orbital path is not circular-shaped. When observations were made from the steady earth, it is found to be producing an eccentric type of orbital path. It is because of the uneven motion that occurs due to the amalgamation of different types of circular motion.  The geocentric system is similar to the Ptolemaic system where the earth is at the center and other objects including the sun and other planets revolve around the earth. The Heliocentric system is similar to the Copernican system where the earth and other planets move around the sun at the center of the solar system. According to the Copernican system, the Sun was fixed and placed at or near the center of the Universe with respect to the earth and various other planets that orbit around it maintaining a circular path.

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