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...five planets known at the time (Mercury, Venus, Mars, Jupiter, and Saturn) orbit the Earth. ...s ([[epicycles]]) and that the centers of the epicycle move in a circular orbit (the deferent) around the Earth. With this model he was able to predict the

...of [[Venus (planet)|Venus]] and [[Earth]]. It was the first spacecraft to orbit Jupiter. In 2003, the spacecraft was deliberately sent into Jupiter's atmo

{{rpl|Near Earth Orbit}}

...coupling it is useful to diagonalize the matrix of the corresponding spin-orbit operator within the ''L-S'' basis [consisting of the (2''L''+1)×(2''S''+1) ...good quantum numbers). Then splittings after switching on first-order spin-orbit coupling (''J'' good quantum number). Finally on the right [[Zeeman]] split

*(a) is in orbit around a Sun; *(c) has cleared the neighborhood around its orbit.

...ies, while the orbit of the third pair of binary stars took 2,000 years to orbit the barycenter.<ref name=nytimes2021-01-23/><ref name=SciNews2021-01-25/><r ...ystems orbit each other roughly every day and a half, and the two binaries orbit each other about every four years. The B binary’s members circle each oth

...roughly 2.000 times that of the sun. The star is large enough to fill the orbit of Venus if it were in the sun's position.<ref name="Kaler" /> ...itself a double system with the stars an average of 0.3ˡˡ apart. The stars orbit each other every 63 years or so. Both stars are [[main sequence]] dwarfs. T

...e [[Sun]], taking 248.1 [[Earth]] years to complete one (admittedly odd) [[orbit]]. Like many other worlds in the region, it hosts [[natural satellite|moons ==Orbit and size==

{{r|Reduced period of first Bohr orbit}} ℏ/Eh time 2.418 884 326 505(16) × 10−17 s

...igned to fly in space. Normally this would apply to vehicles that reach [[orbit]], or travel beyond the Earth. However, '''spacecraft''' is also used to d ===Earth Orbit Satellites===

...s [[group action]] of ''G'' on itself, and the conjugacy classes are the [[orbit]]s of this action.

...issile]]s, whose trajectory goes through outer space, but does not achieve orbit. ...yer of the atmosphere and it is in this layer that our man-made satellites orbit the Earth. From this layer, atoms and molecules escape into the void of spa

...ce]], [[gas]] and dust, and has a highly eccentric, [[ellipse|elliptical]] orbit around the [[Sun]]. Comets become visible as they approach the Sun and can

DSCS satellites are in [[satellite orbits|geosynchronous orbit (GEO)]], and have six [[ITU frequency bands|Super High Frequency (SHF)]] co

...n the angle between the plane of this ellipse and the plane of the Earth's orbit. The parallax angle &alpha; is used as a measure of distance: 1<nowiki>''</

...r [[satellite orbits|orbital]] path, or into an escape velocity from Earth orbit. The term explicitly excludes [[ballistic missile]]s used as weapons, in pa

...or objects to either pick up speed as they fall vertically, or maintain an orbit rather than travel in a straight line away from the planet. However, for a * As mentioned already, a person or object in vertical freefall or in orbit around a planet has zero apparent weight. A scale under the person or objec

...Galileo did record it as a fixed star in 1612 and 1613. Aberrations in the orbit of Uranus led French mathematician and astronomer Urbain Joseph Le Verrier ...d of 20 years, the orbit of [[Pluto (dwarf planet)|Pluto]] lies within the orbit of Neptune.<ref name=NASASSENeptune/>

...ded that, to be called a planet, an object must have three traits. It must orbit the sun, be massive enough that its own gravity pulls it into a nearly roun *Has mass sufficient for gravity to clear a path in its orbit.

...inimum of 24 by satellites in full operation capability (FOC) status that orbit in six different planes. The exact number of satellites varies as satellite ...proximately 20,000 km with an inclination of 55 degrees, making a complete orbit in approx. 11 hours, 58 minutes. All Satellites are dual-frequency, in the