An Orrery demonstrates many of the important aspects of the monthly and annual movements of the Earth and Moon. The first was made by George Graham in 1710 for his patron the 4th Earl of Orrery; hence the name.

Both models run electrically. Small model achieves full rotation in ½ hour. The large model in 5 minutes. The large model can also be disconnected from the motor and hand turned to see planets, earth and moon rotation at a higher speed for demonstration purposes. Both models may have the planets moved by hand to specific positions.

This instrument is really a reproduction of an Octant of the mid 17th century. By semi-accurately measuring the height of stars or the sun, the Octant allows navigants to determine geographic latitude.

Astrolabes can be used to solve many astronomical problems that would otherwise require rather sophisticated mathematics. All of they everyday uses are not known, but they were certainly used to tell time during the day or night, to find the time of sunrise and sunset, to locate celestial objects in the sky and also to determine aspects of horoscopes.

The Astrolabe, considered as the mathematic jewl of the Medium Age, was to the end of XVII century the movil instrument most used in the whole history of the Astronomy. It is still in force, because it allows us to undestand in a clear and simply way, the celestial mechanism and the apparent movement of the stars.

The name "astrolabe" comes from the Greek word astro, meaning star, and labio, "that which searches," so it could be translated as "star searcher." Nonetheless, this complex instrument has many other applications.

This instrument is a reproduction of the Nautical Astrolabe called "Valence" for the Irish island it was found, and belonged to the Armee of PhilipeII (16th cen.) It´s placed in the National Maritime Museum of Greenwich and the replica used is in the Naval Museum of Madrid. It is a simplification of the planispherical or astronomical astrolabe and its purpose is to obtain one the latitude, by observing the altitude of the sun or other stars as the Pole Star

This piece is a reproduction of the Nautical Astrolabe of Dundee.This marine astrolabe, made by the Portuguese, is dated between 1550 1555, and can now be found in the Art Gallery and Museum of Dundee. The nautical astrolabe is a simplification of the planispherical or astronomical astrolabe and can only measure the altitude of the stars to calculate the latitude.

This nocturnal watch - horologium nocturnale - is an astronomical instrument used to measure the time through the observation of the Pole Star and the position of brigth stars in the celestial sphere.

The piece is a reproduction of an instrument dated 1570 and signed by Humphrey Cole. This instrument is in the British Museum, London. The original piece has two faces, one of which is this nocturnal. This nocturnal watch is an artifact used to obtain the time at night using the fixed stars in the sky. This instrument appeared at the beginning of the 16th century and began to disappear in the 18th century. This piece was made to calculate the time with the Pole Star and Kochab.

The piece is a replica of a Nocturnal and Tide Computer from 1570, signed by Humphrey Cole, that can be found in the British Museum, London. One of its faces is a Nocturnal and the other is a Tide Computer. The Nocturnal or star clock is an artifact that is used to obtain the time at night using the fixed stars in the sky. The abacus or tide computer is used to figure the time of the tides, that greatly affect navigation both in harbors and for fishing.

Although known as the astronomical ring, it is principally employed as an ecuatorial solar universal quadrant. Its use was widespread during 18th century.

The Voglers contributed to the popularization of this instrument in the 18th century. They have a characteristic style of equinoctial sundial that became known as "Augsburg clocks" for the city in which they were made. The lower part of the original instrument, contained the compass, with its casing inscribed with the latitudes of several important cities between 32º and 60º north.

When the sun dial became popular and still there were no mechanical clocks, a serie of portable dials arose and represented the culmination in the art of gnomonic. One of these dials is the Shepherd Dial, as they were the first in using them in its long days of pasturing. It belongs to the Sun Heigh Dial, since sun height determine time. The one reproduced by us, it is a retort of 1548 which is displayed in the Kunsthistoriches Museum of Vienna.....