Celestial navigation involves the use of astronomical observations to determine one's position on the Earth's surface. It is an age-old practice that has been used by sailors and navigators for centuries. However, there are several other words to describe this process, including astronavigation, stargazing, and celestial guidance. Astronavigation includes the use of celestial bodies to navigate across the seas. Stargazing involves observing the positions of stars to determine one's location and direction of travel. Celestial guidance involves the use of stars and celestial objects to navigate through the night sky. Overall, these words all describe the same concept of navigation through the observation of celestial phenomena.