Anonymous, French geared astrolabe

INTRODUCTION
- Man and the stars
SECTION I
- The dawn of astronomy: Mesopotamia, Egypt and the Biblical Cosmos
SECTION II
- The cosmos becomes a sphere
SECTION III
- The geometry of the cosmos
SECTION IV
- The skies of Islam
SECTION V
- Evangelisation of the cosmos
SECTION VI
- The Renaissance of Astronomy
SECTION VII
- Galileo: the cosmos through the telescope
SECTION VIII
- From Galileo to Newton

Astrolabe with monastic numbering system

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Anonymous
French geared astrolabe, 14th century
London, Science Museum, inv. 1880-32

The calendar mechanism on the rear of this astrolabe is, as far as we are aware, the oldest geared mathematical device ever to have been built in the West.