The color Dial charts are intended for use with 90 degree and 360 degree dials. Our laminated dials 90 degree or 360 degree dials are sized to fit them, or it is possible to obtain plastic or metal dials from other sources. Dials are special tools used for Uranian Astrology and Cosmobiology. They enable seeing all hard aspects (conjunction, semi-square, square, sesquiquadrate, opposition) at a glance and also make it very easy to see midpoints. A dial is attached to a dial chart (such as our dial charts that are sized to fit them) or to a blank sheet of paper with a thumb tack through the center. A tie tack or small piece of eraser can be placed on the tack point to hold the dial in place. The dial is then turned to point to whatever planet, point or midpoint one wishes to examine. In the Uranian system, midpoints are considered very important. For further information: Maria Kay Simms’ book, Dial Detective, is an illustrated guide to learning the basics of Uranian Astrology and how to work with dials.