It was way before that. Hipparchus created the first map of the celestial sphere in the second century BC.DrDu said:Of course today we consider this trivial. But I thought that some medieval monks and arab sky mongers created thousand of strange names for it.
A projection to firmamentum, also known as a celestial sphere projection, is a method of representing the celestial sphere on a two-dimensional surface. It is used to map the positions of stars and other celestial objects onto a flat surface for observation and study.
A projection to firmamentum works by projecting points on the celestial sphere onto a flat surface. This is typically done by tracing lines from the center of the celestial sphere to the surface, creating a grid-like pattern. The resulting map can then be used to determine the positions and movements of celestial objects.
One advantage of using a projection to firmamentum is that it allows for a more accurate representation of the celestial sphere compared to other methods. It also allows for easier measurement and calculation of celestial positions and movements.
One limitation of a projection to firmamentum is that it can only represent half of the celestial sphere at a time. This is because it is a two-dimensional representation and the celestial sphere is three-dimensional. Additionally, different projection methods may introduce distortions or inaccuracies in the map.
A projection to firmamentum is still used in modern astronomy for mapping and studying the positions and movements of celestial objects. It is also used in navigation and timekeeping, as well as in the creation of star charts and other astronomical tools.