Practical Ninja Knowledge

The Ninja devised an ingenious method of telling time by using a cat's eyes. Since a cat has such sensitive eyes, they adjust frequently as the sun passes through the sky. This picture illustrates how the Ninja used this knowledge to approximate time:

The Ninja, like sailors, used the stars to navigate at night but they also discovered 2 other ways of determining direction. One is through the use of a tree stump. If the Ninja came across the stump of a tree, he simply looked at the growth rings to tell which direction was North. The rings become narrower and closer together as they approach North and wider and further apart as they approach South.