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Is there a database/website which shows all comets which have passed Earth and have been viewed? Is there any country specific viewing database as well?

I would like to do a search on the lines of : Show me all comets were visible from India during 1950 to 1960?

Any searches on Google have not returned anything, so querying this exchange site.

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No idea about a specific directory, but there's a database of comets in Stellarium which shows realtime positions of all known comets. You can program a script to find all comets which have been viewed from Earth(visible in sky) and where. Does that help you a bit? –  Cheeku Mar 10 '13 at 16:16
    
I will try this. –  eminemence Mar 11 '13 at 5:58
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I would try here, generate an ephemeris for the object of interest (some objects may already be in the database.)

HORIZONS Web-Interface

This tool provides a web-based limited interface to JPL's HORIZONS system which can be used to generate ephemerides for solar-system bodies. Full access to HORIZONS features is available via the primary telnet interface. HORIZONS system news shows recent changes and improvements. A web-interface tutorial is available to assist new users.

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