Astrolabes

With this instrument is able to calculate the age of the moon and the time of high tide. Materials : brass and wood base Diameter : 120mm Height : 180mm Thickness : 6mm Other characteristics : detailed description of the functioning, brief history of the instrument, supplied with gift packaging.

Reproduction of Nocturnal ( Horologium noctis or Noctilabium ) constructed by Girolamo della Volpaia in 1568. The original is in the History of Science Museum in Florence. Having been made before the Gregorian reform of the calendar and probably with little tables accurate position of the stars, to use correctly this nocturnal, 38 days must be added to the date on which the observation is made. It works by observing the North Star and the Big Dipper. Materials : brass and wood base Diameter :...

This calendar start at Junuary 1, 1600, and ends at December 31, 1799. It is based on a repeating cycle of 400 years and a solar cycle of 28 years. It works by means of the "Dominical letter". You can find out on the day of the week of any event of which we know only the date and the year. Or, you may get dates, knowing the day (eg Sunday), month and year. Materials : brass and wood base Diameter : 90mm Thickness : 15mm Other characteristics : detailed description of the functioning, brief...

Once you have prepared and positioned the astrolabe for a specific night, the celestial vault will be exactly represented, and The instrument will indicate: - the declination of the Sun - the declination of a star - the right ascension of the Sun - the right ascension of a star - the angular hour of a star - the angular hour of the Sun, solar time - sidereal time at this moment - unequal hours of the Sun - some position of the stars Materials : brass and mahogany wood base Diameter : 100mm...