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Astronomical Calendar 2013 cover painting. The First-Quarter Moon over Vernazza - KMK ASTRONOMICAL CALENDAR :)

SeaSky Astronomy Calendar 2013 May 25 - Penumbral Lunar Eclipse. July 27, 28 - Delta Aquarids Meteor Shower August 11, 12 - Perseids Meteor Shower.

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Astronomical compendium This astronomical compendium, in the shape of a Missal, carries the coat of arms of the Company of Jesus (IHS). The outer face of the lid bears a lunar dial showing the phases of the moon; the inner face is engraved with the hour lines. Inside, there is a tilting gnomon mounted on a compass (now missing), that ensured the instrument's correct orientation and allowed its use as a dial. The back of the book displays the planetary hours.

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This early Persian astrolabe with a geared calendar movement is the oldest geared machine in existence in a complete state. It illustrates an important stage in the development of the various complex astronomical machines from which the mechanical clock derives.

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