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It's because we are going round the Sun and so are all the planets. For that reason the time it takes for a planet to go round the ecliptic and arrive back at the same apparent position - called its synodic period - is longer than a year.
Venus and Mars have the longest synodic period because their times to go round once are the closest to 365 days. They take 225 and 687 days to go round but the synodic periods are 584 and 780 days.
On the other hand the far-out planets do not move much in a year. Neptune takes 165 years to go round so its synodic period is only a little over 365 days and is 367½ days.
What else can I help you with?
What moves faster planets or stars?
Relative to the Earth, almost all stars are moving faster than any planet is.
Are Earth and Mars Stars or Planets?
Earth and Mars are planets, not stars. Stars are massive celestial bodies that generate light and heat through nuclear reactions in their cores, while planets are smaller bodies that orbit stars. Earth and Mars are both planets in our solar system that orbit the Sun.
What is visible at night from the earth?
the stars and some of our planets
What does astronemers do?
an astronemer studys the earth, planets and stars
What causes constellation?
A constellation is caused by two things, the first of which is the arrangement of the stars (or planets) themselves in the sky when viewed from a particular perspective. Perspective is the second cause, that is, the human ability to see the arrangement of stars, then to see similarities with other objects in comparison to that arrangement.
What objects in space above earth take pictures of stars and planets?
its called a satellite, a large object floats in space above earth to take pictures of stars and planets
Who moves the planets sun or stars?
How far is the earth to the sun?
What is the family of stars and planets that the earth belongs to?
Solar System
Why do planets change their position with respect to stars?
Because the Earth and all the planets move in orbits round the Sun, while the stars appear to be fixed if we disregard the Earth's daily rotation.
What do planets revolve around?
Planets orbit stars. Our planet (earth) orbits a star we call the sun.
Where is the best place to to look at the stars and planets on earth?
Tucson, Arizona
What did people think that the planets and stars orbit around?
around Earth!
