Techniques to help you along your way in situations where standard navigation techniques and equipment cannot be used.
Step 1: i. Notice about Copyright
I'm just adding this to cover myself legally.
Techniques used in celestial navigation follow the standard course of planets and stars, as well as the physics behind that governs those courses, which are laws of nature. U.S. and international copyright law forbid the copyright, patent, trademark, etc of natural laws. Just because you discovered it, doesn't mean you own it.
The reason I include this is that some of these techniques are several thousand years old, while a few have only been discovered recently with current technology. But again, the same principle applies, you can't own it.