Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The gnomon is the part of a sundial that casts the shadow. Gnomon ( ) is an ancient Greek word meaning "indicator", "one who discerns," or "that which reveals." It has come to be used for a variety of purposes in mathematics and other fields. In the northern hemisphere, the shadow-casting edge is normally oriented so that it points north and is parallel to the rotation axis of the Earth. That is, it is inclined to the horizontal at an angle that equals the latitude of the sundial's location. On some sundials, the gnomon is vertical. These were usually used in former times for observing the altitude of the Sun, especially when on the meridian. The style is the part of the gnomon that casts the shadow. This can change as the sun moves. For example, the upper west edge of the gnomon might be the style in the morning and the upper east edge might be the style in the afternoon.

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