In physics, an **orbit** is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System. Orbits of planets are typically elliptical.

Current understanding of the mechanics of orbital motion is based on Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of space-time, with orbits following geodesics. For ease of calculation, relativity is commonly approximated by the force-based theory of universal gravitation based on Kepler's laws of planetary motion.

Read more about Orbit: History, Planetary Orbits, Newton's Laws of Motion, Analysis of Orbital Motion, Orbital Planes, Orbital Period, Specifying Orbits, Orbital Perturbations, Astrodynamics, Scaling in Gravity, Further Reading

### Other articles related to "orbit, orbits":

**Orbit**

... When the first calculations of the comet's

**orbit**were made, scientists realized that it was going to pass just 0.1 AU from the Earth on 25 March ... Moreover, the comet's

**orbit**showed that it had last returned to the inner Solar System approximately 17,000 years earlier ...

... If f n (x) = f n+m (x) for some integer m, the

**orbit**is called a periodic

**orbit**... a given x is called the period of the

**orbit**... science is the algorithmic problem of finding the first periodic point in an

**orbit**, and the period of the

**orbit**...

**Orbit**

... inserted into a 93.49-nautical-mile (173.14 km) by 194.44-nautical-mile (360.10 km) parking

**orbit**, instead of the planned 100-nautical-mile (190 km) circular

**orbit**... Then, after the standard two parking

**orbits**to check out the vehicle's readiness for Trans Lunar Injection, the S-IVB failed to restart ... engine to raise the spacecraft into a high

**orbit**, as had been done in Apollo 4, in order to complete some of the mission objectives ...

**Orbit**al Launch Summary - By

**Orbit**

... regime Launches Successes Failures Accidentally Achieved Remarks Low Earth

**orbit**11 ... to ISS Medium Earth

**orbit**1 ... Geosynchronous/transfer 0 ... High Earth

**orbit**0 ... Including lunar ...

**Orbit**- Further Reading

... Theory of

**Orbit**Determination (Cambridge University Press 378 pages 2010) ... Discusses new algorithms for determining the

**orbits**of both natural and artificial celestial bodies ...

### Famous quotes containing the word orbit:

“Words can have no single fixed meaning. Like wayward electrons, they can spin away from their initial *orbit* and enter a wider magnetic field. No one owns them or has a proprietary right to dictate how they will be used.”

—David Lehman (b. 1948)

““To my thinking” boomed the Professor, begging the question as usual, “the greatest triumph of the human mind was the calculation of Neptune from the observed vagaries of the *orbit* of Uranus.”

“And yours,” said the P.B.”

—Samuel Beckett (1906–1989)

“The human spirit is itself the most wonderful fairy tale that can possibly be. What a magnificent world lies enclosed within our bosoms! No solar *orbit* hems it in, the inexhaustible wealth of the total visible creation is outweighed by its riches!”

—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)