Secrets of the Viking Navigators Quotes

“The thicker the crystal the better the separation of the black mark. One more thing, the bearings are best at sunrise and sunset, when the sun is slightly below the horizon.”
― Leif K. Karlsen, Secrets of the Viking Navigators: How the Vikings Used their Amazing Sunstones and other Techniques to Cross the Open Ocean

“said, “First of all, in order to use the sunstone you must place a small spot of pine tar on top of the stone, on the side which faces towards the sky. When you are using the crystal for the first time, place a small wooden pointer along either one of the longest sides. This will be a guide for which side to point toward the brightest part of the sky. Then you must hold the stone overhead and view the stone from underneath. Notice the double image of the black dot? Now, line up the pointer towards the brightest part of the sky. When you rotate the stone slightly back and forth, holding it flat, you will see that one spot fades and the other becomes darker. When the two images appear to be equal in value, note the position of the stone and the direction of the pointer. This is the true bearing to the sun. The stone is very accurate.”
― Leif K. Karlsen, Secrets of the Viking Navigators: How the Vikings Used their Amazing Sunstones and other Techniques to Cross the Open Ocean