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[[Berkas:orbit2.gif|thumb|200px|Dua buah benda dengan [[massa]] yang sedikit berbeda mengelilingi suatu [[pusat massa bersama]]. Ukuran, dan jenis orbit seperti ini mirip dengan sistem [[Pluto]]-[[Charon (bulan)|Charon]].]] Dalam [[fisika]], suatu '''orbit''' adalah sebuah jalanjalur yang dilalui oleh objek, di sekitar objek lainnya, di dalam pengaruh dari [[gaya]] tertentu. Orbit pertama kali dianalisa secara matematis oleh [[Johannes Kepler]] yang merumuskan hasil perhitungannya dalam [[hukum gerakan planet Kepler|hukum Kepler tentang gerak planet]]. Dia menemukan bahwa orbit dari [[planet]] dalam [[tata surya]] kita adalah berbentuk [[elips]] dan bukan [[lingkaran]] atau [[episiklus]] seperti yang semula dipercaya.
== Sejarah ==
Pada saat struktur atom pertama di selidiki pada awal abad 20, atom di gambarkan sebagai tata surya kecil yang di ikat dengan Gaya [[Coulomb]]. Model ini tidak sejalan dengan elektrodimanika dan model ini secara perlahan diperbaiki sejalan dengan perubahan teori [[kuantum]]. Akan tetapi, masih ada istilah peninggalan "orbit" untuk menggambarkan keberadaan energi elektron dalam mengitari nukleus atom.
{{wide image|Orbitalaltitudes.svg|2000px|Orbit altitude|left}}
== Referensi ==
{{Reflist}}
* {{cite book|author=Abell, Morrison, and Wolff|title=Exploration of the Universe|edition=fifth|year=1987|publisher=Saunders College Publishing}}
* Linton, Christopher (2004). ''[http://books.google.co.uk/books?id=B4br4XJFj0MC&pg=PA285&lpg=PA285&dq=Leibnitz+on+centrifugal+force&source=bl&ots=ul5sM-8hez&sig=3eV8RZGxy6Czk3uZZ4_6nxhr3gQ&hl=en&ei=VYT_SaDtOsmrjAfv44iIBw&sa=X&oi=book_result&ct=result&resnum=5 From Eudoxus to Einstein]''. Cambridge: University Press. ISBN 0-521-82750-7
* Swetz, Frank; et al. (1997). ''[http://books.google.com/books?id=gqGLoh-WYrEC&pg=PA269&dq=reaction+fictitious+rotating+frame+%22centrifugal+force%22&lr=&as_brr=3&as_pt=ALLTYPES&ei=JUH7SYr3GIzckQSSx4XVBA#PPA269,M1 Learn from the Masters!]''. Mathematical Association of America. ISBN 0-88385-703-0
== Pranala luar ==
* {{id}} [http://orinetz.com/planet/animatesystem.php?sysid=QUQTS2CSDQ44FDURR3XD6NUD6&orinetz_lang=2 Simulasi orbit planet-planet di dalam Tata Surya]
{{Commons category|Orbits}}
* [http://www.calctool.org/CALC/phys/astronomy/planet_orbit CalcTool: Orbital period of a planet calculator]. Has wide choice of units. Requires JavaScript.
* [http://orinetz.com/planet/animatesystem.php?sysid=QUQTS2CSDQ44FDURR3XD6NUD6&orinetz_lang=1 Browser Based Three Dimension Simulation of Orbital Motion]. Objects and distance are drawn to scale. Run on JavaScript-enabled browser such as Internet Explorer, Mozilla Firefox and Opera.
* [http://www.phy.hk/wiki/englishhtm/Motion.htm Java simulation on orbital motion]. Requires Java.
* [http://www.ncdc.noaa.gov/paleo/forcing.html NOAA page on Climate Forcing Data] includes (calculated) data on Earth orbit variations over the last 50 million years and for the coming 20 million years
* [http://www.bridgewater.edu/~rbowman/ISAW/PlanetOrbit.html On-line orbit plotter]. Requires JavaScript.
* [http://www.braeunig.us/space/orbmech.htm Orbital Mechanics] (Rocket and Space Technology)
* [http://astrobiology.ucla.edu/OTHER/SSO/ Orbital simulations by Varadi, Ghil and Runnegar (2003)] provide another, slightly different series for Earth orbit eccentricity, and also a series for orbital inclination. Orbits for the other planets were also calculated, by {{cite journal | author=F. Varadi, B. Runnegar, M. Ghil | title=Successive Refinements in Long-Term Integrations of Planetary Orbits | journal=The Astrophysical Journal | volume=592 | year=2003 | pages=620–630|doi=10.1086/375560 | bibcode=2003ApJ...592..620V}}, but only the [http://www.astrobiology.ucla.edu/OTHER/SSO/Misc/ eccentricity data for Earth and Mercury] are available online.
* [http://www.lri.fr/~dragice/gravity/ Understand orbits using direct manipulation]. Requires JavaScript and Macromedia
* {{cite web|last=Merrifield|first=Michael|title=Orbits (including the first manned orbit)|url=http://www.sixtysymbols.com/videos/orbit.htm|work=Sixty Symbols|publisher=[[Brady Haran]] for the [[University of Nottingham]]}}
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[[Kategori:Orbit| ]]
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