Important Info: Cosmos is optimized for Internet Explorer. Other browsers - like Mozilla Firefox or Google Chrome - will give some errors like in the visualization of the top menu or will not run some encoded Javascripts applications. We're trying to find a solution. Meanwhile, please use Internet Explorer to visualize Cosmos. Thank you very much.
 

Cosmos is the first portuguese ephemerides server, and has implemented the last planetary theory from JPL/NASA, the DE408, developed by Dr. E. Myles Standish, covering a time span of 20000 years of ephemerides. Still, it also covers the earlier theories (DE200, DE405 – used in the elaboration of the Astronomical Almanac – and DE406). In our server you will find the most accurate planetary and stellar positions in the sky.


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News: Signup our Newsletter in the left corner.

News: Now read The Sky this Month for sky events information and have Clickable News always updated from ScienceDaily, The New York Times and Space.com....
 

News: Article - Interview to Dr. Jorge Carneiro, researcher at the Astronomical Observatory of the University of Porto.  (includes Closest Approaches to the Earth by Minor Planets, Closest Approaches to the Earth by Comets, and Forthcoming Close Approaches To The Earth) ( read more... )
 

News: The Ephemeris Server ( Planetary and Stellar ) is finally working - check it out. And the Atlas online was improved and revised, giving now detailed maps also of 7 million places (powered by GOOGLE Maps).
 

News: There's now a software section under the "Tools" menu. You can find our first freeware, the "Cosmos 13th", a prime number generator and tester.
 

Support us: We are trying to maintain this service always free of charge; but we need your support, if you can.

Calculate the circumstances of solar and lunar eclipses, from 2000 BC to 3000 AD.

(REVISED - minor bugs were corrected) After an extensive investigation, a treatment of hundreds of data sources and an exhaustive study for the implementation of this information online, Cosmos has now a database – an Atlas – with about 7 million different places on Earth (giving its latitude, longitude, and some other details about the specified place). Now, improvements were made, and maps of locations are provided (powered by GOOGLE Maps).