The firmament is understood as the celestial dome that covers planet Earth and that has that color only within it, since when it goes out into outer space it loses its celestial tone and turns black. The firmament is the space where all the stars are found, from the stars, to the planets and the shooting stars. Observed from Earth, it is the place where the stars land, forming the different constellations known as mythical characters. The name of firmament comes from the idea that was had in antiquity that the stars were fixed in this space, which is why the name represents the firm place of existence.
The knowledge that the human being had about the firmament was very different depending on the historical time in which we found ourselves. Their observation was also always of great importance since the different constellations that were found in the sky served for a long time as a guide for navigators as well as for those who moved from one place to another and did not have exact knowledge of where they were or where they were. what distance.
Although the sky is a rather abstract concept, today it is still used as a synonym for sky and while the concept includes the quality of being celestial, the truth is that that color changes according to the time of day. The beauty of the sky is to observe how in open spaces in which buildings and human constructions do not occupy the horizon, its extension is much greater than what one can normally observe in large cities: in the countryside, the sky it reaches the level of the horizon as do the stars, so the effect that this generates is precisely that of a vault that expands over our heads.
