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JPL Horizons on-line solar system data and ephemeris computation service

System About Horizons The JPL Horizons on-line solar system data and ephemeris computation service provides access to key solar system data and flexible production of highly accurate ephemerides for solar system objects ( loading… ). ( unable to load body counts… please try later ).

Some Windows terminal software does not fully implement the telnet protocol and does not send port numbers, even if you enter them. Failure to do so may result in no response from the system or an error message, even when your job-content appears perfect from within your email client. Modern graphical e-mail systems often insert hidden font and formatting codes that Horizons cannot interpret.

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