During the fall and winter, the time is read from the face towards the camera. During the spring and summer, the time is read on a similar face on the back of the dial. On the equinoxes, the gnomon will not cast a shadow on either face because the sun will be on the celestial equator.
Another form of the equatorial dial, often called a "bowstring" equatorial
Yet another form, a variation of the "Thew patent"
Armillary Dials
Armillary dials are equatorial dials with extra circles emulating those found on armillary spheres. A true armillary sphere is not a sundial but a model of the heavens. The extra circles on an armillary dial actually hinder timkeeping by blocking the sun at various times.
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