What software system is designed to estimate latitude and longitude astronomically?

STELLA is specifically designed for celestial navigation and serves as a tool to estimate latitude and longitude using astronomical measurements. It utilizes various celestial bodies—such as the sun, moon, and stars—and applies mathematical calculations to determine a vessel's position at sea based on sightings of these bodies.

The software integrates principles of spherical astronomy, making it particularly useful for sailors who rely on traditional navigation methods and wish to cross-reference their positions using celestial navigation techniques. Its features may include sight reduction calculator functions and visual learning tools to understand celestial navigation better.

Other options, while related to navigation, serve different purposes: GPS Navigators use satellites for positional data rather than astronomical calculations; the Nautical Almanac provides tables and information for celestial navigation but does not calculate positions directly; and Chartplotters are primarily used to visualize plotted courses on electronic charts and do not perform astronomical estimations.