The SNF file extension is primarily associated with Starry Night, a comprehensive astronomy software suite used by amateur and professional astronomers to simulate the night sky. An SNF file typically contains specific astronomical data, saved observation sessions, or custom sky views configured by the user. These files store parameters such as the observer's location on Earth or another celestial body, the specific date and time of the observation, zoom levels, and various display settings like constellation lines, labels, and celestial coordinates. By saving an SNF file, users can revisit a specific celestial event or share their unique telescope views with others. The format is proprietary to Simulation Curriculum Corp, the developers of Starry Night. Because it is a specialized data format, it is not meant to be opened by standard text editors or image viewers, but rather through the Starry Night application itself to render the 3D celestial environment accurately. It serves as a configuration and state-save file for the simulation engine, ensuring that all visual preferences and astronomical calculations are preserved for future sessions.