Over 10 million variable star estimates dating back over 100 years.

NASA's ADC is a resource for astronomical data, catalogs, and journal tables.

Provides an interactive sky atlas allowing users to visualize digitized images of any part of the sky. Includes astronomical catalogs, personal user data files, and interactive access to related data from the Simbad database, and Vizier service.

Data from the National Astronomical Observatory of Japan. Includes catalog service, data archives, imaging services, and journals.

Patrick Shopbell's Astronomy Resources. Contains data archives, astronomical catalogs, atlas of nearby dwarf galaxies, and links.

Daily archive of interesting astronomy photos by NASA.

Offers information services, and archiving of various astronomical issues.

Contains information on the PDS and APM microdensitometer facilities, Carlsberg Meridian telescope, data archives, and processing center.

Contains digitized sky survey, IUE archive, star catalogs, and links.

Data center that is part of the Cambridge Astronomy Survey Unit providing a selection of data from the UK's ground based telescopes. Includes archives, and catalogs.