• The meridian line
    • Introduction
    • Description
    • The oracle of Apollo
    • The controversy
    • Gnomon's lens
  • Principles
    • How it works
    • The problem of penumbra
    • Animation
    • The diurnal motion
  • Solar image
    • Calculation of the position
    • Is it noon at midday?
  • High resolution
  • Gallery
    • Gnomon
    • Meridian line
    • Cassini room
    • San Petronio/Perinaldo
                                                     
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