A planisphere is a scale representation of a world map or world map as it is also known. Said graph shows all the elements contemplated in the spherical map of the earth, but arranged in a two-dimensional plane in which the measurements and divisions are the meridians and isobar lines. The planispheres are designed and adapted to the scale required by expert cartographers who make all kinds of maps in which data is emptied.
The planispheres can show geographic, demographic, political and territorial, geological information (pointing out rivers, mountains, deserts and more) taking into account relevant historical criteria for those who request it. There are planispheres that do not show the boundaries of the countries, but they do show the type of soil or climate by regions, these planispheres are used for cases in which changes in climate or plate movements compromise the stability of planet earth.
The first terrestrial planispheres were related to the Babylonian culture, dating back to 2,500 BC while the Greeks contemplated the celestial planispheres in the 5th century BC, today the most popular world map planisphere is the Mercator projection.
The celestial or celestial planisphere is a two-dimensional chart or map that shows the stars and planets having as an axis or point of reference one side of the earth in order to locate them in the sky. The celestial planisphere, unlike the terrestrial, is shaped like a disk and is made up of two of these that move on a cylindrical or pointed end of a piece called a pivot.
By rotating the discs, you can align the times and days in order to know which point is being observed in the sky, it is important to know what daylight saving time is. The astronomers who study the stars using two projection methods: the first is the azimuthal equidistant projection polar consisting of a drawing in the center of one of the celestial poles, with circles of equal declination that appear equidistant from each other and poles) and the stereographic projection in which the distances between the declination circles are enlarged while the format of the constellations remains unchanged.
