Terrestrial globe

In the eighteenth century, globe builders were active in most European countries. This terrestrial globe was made between 1789 and 1791 by the English instrument makers George and Dudley Adams. The terrestrial globe is comprehensive and has many functions. First of all, the geographic longitude and latitude of a place can be read using the equator and meridian circle. Furthermore, the two other parallel circles around the globe show the solar shadow. The copper ball on the short movable arm represents the sun. The part of the earth before the circles is illuminated by the sun, the area between the circles is in twilight and behind the circles it is night. Below the globe is a calendar plate, which shows the position of the sun for each day of the year. The signs of the zodiac can also be read from it. By means of the two dial plates with gear wheels above the calendar plate the difference of longitude and the time difference between two places can be established and the time of sunrise can be established.