Using 300000,000 km for the diameter of Earth's orbit, calculate the speed of light based on Roemer's 1300-s estimate. How does it differ from a modern value fro the speed of light? speed = distance\time = 300,000,000 km\ 1300 s = 231,000 km/s. This value is 77 percent of the modern value.
A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved trajectory objects that make up an orbit in celestial mechanics. Orbit often refers to a trajectory that repeats itself on a regular basis, while it can also apply to a non-repeating trajectory. According to Kepler's rules of planetary motion, planets and satellites roughly follow elliptic orbits, with the center of mass orbiting at a focal point of the ellipse.
Newtonian mechanics, which explains gravity as a force obeying an inverse-square law, can generally mimic orbital motion well.
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