THE SUNDIAL original: "Solarium Gnomonicum." "Solarium" refers to a sundial, while "gnomonic" relates to the gnomon, the pin or plate on a sundial that casts the shadow.

Gnomonic

or a

New, easy, and accurate

METHOD

For drafting all types of

Solar Clocks

The term "Horologiorum Solarium" refers generally to sundials or any device used to tell time by the sun's position.

on any surface, whether flat or curved,

as well as those situated irregularly in any

position, most certainly and

expeditiously.

Explained and demonstrated

Father Christopher Grienberger

Christopher Grienberger (1561–1636) was a prominent Jesuit mathematician and astronomer who succeeded Christopher Clavius at the Roman College and was a contemporary of Galileo.

of the Society of Jesus.

The seal of the Society of Jesus (Jesuits) is depicted: the monogram "IHS" A Christogram derived from the first three letters of the name "Jesus" in Greek. in capital letters with a cross rising from the crossbar of the "H" and three nails meeting at their points below the letters—representing the instruments of the Passion—all enclosed within a circular sunburst of alternating straight and wavy rays.

ROME,

At the press of the heirs of Corbelletti. 1638.

WITH THE PERMISSION OF THE SUPERIORS.

original: "Superiorum Permissu." This indicates the work had passed the internal censorship of the Jesuit Order and the Catholic Church.