Tbeli Abuserisdze

A son of Ivane Abuserisdze, eristavt-eristavi ("archduke") of Khikhata (Upper Adjara, southwestern Georgia), he is principally known for his original treatise, The Complete Timekeeper, which contains information related to calendars, descriptions of different systems for maintaining chronology, dates of ecclesiastic holidays, tables of moonrise and moonset, information on special cycles, etc.

Abuserisdze's work is purely theoretical, based largely upon his own mathematical investigations rather than on direct astronomical observations.

It contains the Abouserdester's family of mathematics, as well as important information about the life and morals of that time, as well as the data of specific historical character.

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