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Three volvelles,—examples of the printers’ craft. Printed by Ioannem Baptisum Soamscum for Theatrum Mundi by Giovanni Galluci, 1588; Erhard Ratdolt for Laudem Operis Calendarij by Joannes Regiomontanus, 1485; and Gregorio Bontio for Cosmographia by Peter Apian, 1550.

Three volvelles,—examples of the printers’ craft. Printed by Ioannem Baptisum Soamscum for Theatrum Mundi by Giovanni Galluci, 1588; Erhard Ratdolt for Laudem Operis Calendarij by Joannes Regiomontanus, 1485; and Gregorio Bontio for Cosmographia by Peter Apian, 1550.

This is a volvelle, a medieval device that allowed you to calculate the phases of the moon and the latter's position in relation to the sun. What's most remarkable about the device is not so much its crafty nature - it consists of complex layers of rotating disks - but that it is usually fitted inside a medieval book.  (BL): London, British Library, Egerton MS 848 (15th century).

This is a volvelle, a medieval device that allowed you to calculate the phases of the moon and the latter's position in relation to the sun. What's most remarkable about the device is not so much its crafty nature - it consists of complex layers of rotating disks - but that it is usually fitted inside a medieval book. (BL): London, British Library, Egerton MS 848 (15th century).

Book L of the Metaphysics touches upon what Aristotle calls the "Unmoved Mover." In short, this is Aristotle's conceptualization of God which is worthy of our attention both because of the inherent interest of the topic and because of the...

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