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Book Review: Understanding the Tides: Tides: A Scientific History

one table to another in the same set. However, Mercier shows that most of the parameters depend on those from the Ptolemaic tradition in the Almagest, rather than in the Handy tables, and those of al-Battant's zij in the Hebrew version by Bonfils (c. 1350). As for the "proto-Plethon" tables, the recomputed mean motions show close agreement with those in the Persian syntaxis, a set of tables largely transcribed from the zlj of Nasir ai-Din al-Tusi (13th century). In this excellent volume Tihon and Mercier gives us new insight into the transmission of astronomical material through Byzantium. In doing so, they have sharply divided their tasks. In fact, what we have here are two complementary books bound together, written in collaboration "entre deux personnes de formations differentes (philologie et mathematiques), ecrivant dans des langues differentes (francais et anglais) et utilisant des ordinateurs differents (Macintosh et PC)", as Dr Tihon puts it in her preface. Sometimes this sharp distinction seems awkward, and it is regrettable that this superb piece of scholarship ends up with two different bibliographies and two different indexes compiled with non-uniform criteria.