Cathedrals as Solar observatories. Second printing
HEILBRON, J.
London - Harvard University Press - 1999 - 366 pp. - Withe 8 coloured plates and many figures in black/white - 25x17 cm. - Paperback - ISBN: 0674854330
Between 1650 and 1750 four Catholic churches were the best solar observatories in the world. Built to fix a date for Easter, they also housed instruments that threw light on the disputed geometry of the solar system. This work tells how observatories came to be and how they worked.
