Anonymous, The committee for the reform of the calendar

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

Atlas coelestis seu Harmonia Macrocosmica

The committee for the reform of the calendar

De mundi aetherei recentioribus phaenomenis

Le grand atlas, ou, Cosmographie Blaviane

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Anonymous
The committee for the reform of the calendar
Biccherna panel, Siena, July 1582-June 1583
Siena, Archivio di Stato, n. 72

This painted panel celebrates the introduction of the Gregorian calendar, which replaced the old Julian calendar in Catholic countries on 4 October 1582. The reform was implemented by moving the date forward from 4 to 15 October. In this scene we see Pope Gregory XIII, enthroned, chairing the calendar committee.