The time it takes to orbit the Sun depends on the planet. Because of gravity, the mass of the planet and other considerations, objects closer to the Sun tend to have a faster orbit. Earth, the third planet from the Sun, takes 365.26 days to orbit the Sun.Continue Reading
Mercury, the closest planet to the Sun, orbits the Sun in 88 Earth days, and Venus, which is the planet second closest to the Sun, orbits it in 224.7 Earth days. Mars, the fourth planet from the Sun, completes an orbit around the Sun in about 1.8 Earth years, and Jupiter orbits the Sun in 12 Earth years. Though it is the fifth planet from the Sun, it is so far away from the star that it's considered the first of the outer planets. The asteroid belt intervenes between Mars and Jupiter.
Saturn orbits in 29.45 Earth years, and it takes Uranus 84 Earth years to complete an orbit. Neptune is so far away from the Sun, and its orbit is so irregular, that there are times when it is farther from the Sun than the dwarf planet Pluto. It completes an orbit around the sun every 248 years. This means that since it was discovered in 1846, it has completed one orbit.Learn more about Our Sun
Copernicus’ heliocentric model shows how an observer on Earth orbiting the sun would see a planet with a longer orbital period appear to move backward and then forward again. Ptolemy’s model, with the Earth at the center, required complex additional mechanics to explain retrograde motion that never matched the observed motion.Full Answer >
The main source of energy for the planet is the sun. Solar energy includes light, radio waves and X-rays, all of which provide energy on Earth.Full Answer >
Because the sun is not a planet, a solar day is undefined. The definition of a solar day is the amount of time it takes for a planet to rotate on its axis before the sun returns to the same spot in the sky.Full Answer >
Sunset is the exact time the upper disk of the sun is at the horizon, whereas dusk is when the center of the sun is 18 degrees below the horizon, according to the National Institute of Standards and Technology. The hazy twilight in between sunset and dusk is caused by the scattering of sunlight in the upper atmosphere that gives the horizon a light blue appearance.Full Answer >