Question

1. what were copernicuss contributions to astronomy?
2. summarize keplers first law of planetary motion.
3. calculate the eccentricity of this ellipse using the equation d/l = e; where d = 24 and l = 48.

Explanation:

Step1: Recall Copernicus' work

He proposed the heliocentric model.

Step2: Recall Kepler's first law

Planets move in elliptical orbits with the Sun at one focus.

Step3: Calculate ellipse eccentricity

Substitute values into formula $e=\frac{d}{l}$. Given $d = 24$ and $l=48$, then $e=\frac{24}{48}$.

Answer:

1. He proposed the heliocentric model, which placed the Sun at the center of the solar - system instead of the Earth.
2. Planets move in elliptical orbits around the Sun, with the Sun at one of the two foci of the ellipse.
3. $\frac{1}{2}$