The quadrant was a very popular instrument during several centuries since its use was relatively simple and had no excessive costs. It consists of a quarter circle (90 °) usua- lly made of brass or wood. There were many types with specific applications, initially with the simple application of measuring angles or heights of stars, buildings, mountains ... They were equipped with two viewers along one edge, a weight attached to a rope and engraved scale of 0 to 90 ° with which to make the measurements. With the angle obta- ined once got the measurement object, we can solve specific issues of navigation, also artillery, architecture etc. .
This quadrant Punto Vernal presents , belongs to the class of so-called "schedules".Its main use is to find the time (unequal hours) using the position of the Sun, but has many other applications as discussed below. This type of sundial called "quadrans vetus" (old quadrant) is of Islamic origin and was introduced in Europe in the late Middle Ages, becoming very popular for centuries. It also consists of a square of shadow and on the back contains an original universal con- verter hours of the sixteenth century. A rope holding a weight that will act as a plumb line suspended from a hole in the upper corner of the instrument. A small piece called pearl sliding along the rope.
Calendar slides along the arc of the instrument in order to place it at the exact latitude of the observer, is therefore an instrument that although not universal, it covers a wide range of latitudes for the northern hemisphere.
On the left side is engraved the solar declination scale over a full year. Operation. With our quadrant we can find out the following: -Height Maximum sun for the day to go through the meridian of the place -Declinación Sun for that day -latitude of where we are -hours past from dawn (unequal hours) It is made of old brass plated metal, the base is made of wood and comes in a beautiful box for a perfect and unforgettable gift. It is accompanied by a booklet with extensive historical accounts and instructions for use with several examples.
Measures: Height: 12 cm Width 15 cm Thickness: 0.7 cm