Astroinertial guidances refer to a type of guidance system used in space exploration. They incorporate the movements of celestial objects and the inertia of the spacecraft to navigate through space. There are several synonyms for astroinertial guidance, including astro guidance, inertial guidance, celestial navigation, and star tracking. These systems are critical for deep space missions, where traditional navigation systems may not be sufficient. Astro guidance systems have been used extensively in missions such as NASA's Apollo program, the Voyager missions, and recent Mars rovers. The effectiveness of astroinertial guidance systems is a testament to the advances in technology and our ability to explore the vast reaches of space.