A Descriptive Catalogue of Indian Astronomical Instruments

The large masonry instruments designed by Sawai Jai Singh and erected in his five observatories in the early eighteenth century are the culmination of a long process of development in astronomical instrumentation. But what kind of astronomical instruments were used in India before Jai Singh's time? Are any of these extant in museums? Such questions led me to an exploration of museums and private collections in India, Europe and USA for about a quarter century and to the identification of 555+ specimens which are extant or about which photos and other records are available.

A Descriptive Catalogue of Indian Astronomical Instruments is the outcome of this exploration. The renowned historian of science Derek Price remarked once: 'Each instrument is a valuable document in itself, yielding historical and scientific data often unobtainable elsewhere. ...however... the full significance of any one instrument cannot be properly realised except by comparison with the corpus of all such instruments extant.'

This catalogue aims to study each instrument in the context of all the related extant specimens, while laying special emphasis on the interplay between Sanskrit and Islamic traditions of instrumentation. Therefore, each instrument type is organized in a separate section identified by the letters of the alphabet. These section begin with introductory essays on the history of the instrument type and its varieties, followed by a full technical description of every specimen, with art historical notes on the decorations and ornamentation. Moreover, all engraved data are reproduced and interpreted as far as possible. There are also introductory essays on instrument makers. Extracts from some rare Sanskrit texts describing the construction and use of certain instruments are given in appendices, together with translations.

I am publishing the catalogue in installments online. It can be viewed and distributed for academic and personal purposes free of charge. Commercial use is not permitted.

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