POV: WHAT IS Celestial Navigation – The Celestial Sphere! Celestial navigation uses the positions of the Sun, Moon, planets, and stars to find location, while the celestial sphere is the imaginary sphere where these bodies are projected to make calculations, acting as a celestial map with coordinates like declination (celestial latitude) and Greenwich Hour Angle (celestial longitude). It's a fundamental concept for this technique, allowing navigators to plot positions without modern electronics