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The revised second edition of this established dictionary contains over 4,300 up-to-date entries covering all aspects of astronomy. Compiled with the help of over 20 expert contributors under the editorship of renowned author and broadcaster Ian Ridpath, "A Dictionary of Astronomy" covers everything from space exploration and the equipment involved, to astrophysics, cosmology, and the concept of time. The dictionary also includes biographical entries on eminent astronomers, as well as worldwide coverage of observatories and telescopes. Supplementary material is included in the appendices, such as tables of Apollo lunar landing missions and the constellations, a table of planetary data, and numerous other tables and diagrams complement the entries.

New to this edition:

- All entries have been revised and updated to reflect recent developments in the field of astronomy
- Approximately 50 new entries, such as "Juno", "Plutoid", and "Interstellar Boundary Explorer"
- A new appendix listing planetary data
- Entry-level web links are listed and regularly updated on a companion website, expanding the scope of the dictionary