How does an astrolabe work?

Answer 1

Answer

The astrolabe was used by the ancients ( III siecle B.C. in Greece)
for observing the relative positions and altitudes of celestial bodies.
In the Middle Age it become a navigational instrument by the addition
of tables of the Sun´s declination ( angular distance north or south of
the celestial equator), which permitted the sea Navigants to find their
latitude.
In its earlier form it consisted of a disk of wood suspended by a ring.
Around the disk edge were marked the degrees of the circle; a pointer
along which the sun or another star could be sighted was pivoted on a
center pin.
Later on the astrolabes were often made of metal with a plate with the
map of the stars and the zodiac circle on the reverse side. It was then
possible determine the time of the day: after measuring the sun´s altitude,
its position was noted on the circle of tfuyjfyjytjfhe zodiac, a line drawn to a circle
of hours showed the time.

Answer 2

An astrolabe is an ancient astronomical instrument used for determining the position of celestial bodies. It consists of a rotating disk with a pivoted pointer, called an alidade, that is used to measure the altitude of stars or other celestial objects. By aligning the alidade with the celestial body and referencing the corresponding coordinates on the disk, users could determine their position on Earth.