The Constantinople observatory of Taqi ad-Din, founded in

Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...

(today

Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...

) by Taqi ad-Din Muhammad ibn Ma'ruf in 1577, was one of the largest astronomical observatories in the pre-modern world. However, it only existed for a few years and was destroyed in 1580.

History

In 1574,

Murad III Murad III (; ; 4 July 1546 – 16 January 1595) was the sultan of the Ottoman Empire from 1574 until his death in 1595. His rule saw battles with the Habsburg monarchy, Habsburgs and exhausting wars with the Safavid Iran, Safavids. The long-inde ...

became the

Sultan Sultan (; ', ) is a position with several historical meanings. Originally, it was an Arabic abstract noun meaning "strength", "authority", "rulership", derived from the verbal noun ', meaning "authority" or "power". Later, it came to be use ...

of the

Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...

. The empire's chief astronomer, Taqi ad-Din, petitioned the Sultan to finance the building of a great observatory to rival

Ulugh Beg Mīrzā Muhammad Tarāghāy bin Shāhrukh (; ), better known as Ulugh Beg (; 22 March 1394 – 27 October 1449), was a Timurid sultan, as well as an astronomer and mathematician. Ulugh Beg was notable for his work in astronomy-related ma ...

Samarkand Samarkand ( ; Uzbek language, Uzbek and Tajik language, Tajik: Самарқанд / Samarqand, ) is a city in southeastern Uzbekistan and among the List of oldest continuously inhabited cities, oldest continuously inhabited cities in Central As ...

observatory. The Sultan approved, and construction was completed in 1577, John Morris Roberts, ''The History of the World'', pp. 264-74,

Oxford University Press Oxford University Press (OUP) is the publishing house of the University of Oxford. It is the largest university press in the world. Its first book was printed in Oxford in 1478, with the Press officially granted the legal right to print books ...

, at nearly the same time as

Tycho Brahe Tycho Brahe ( ; ; born Tyge Ottesen Brahe, ; 14 December 154624 October 1601), generally called Tycho for short, was a Danish astronomer of the Renaissance, known for his comprehensive and unprecedentedly accurate astronomical observations. He ...

's observatory at

Uraniborg Uraniborg was an astronomical observatory and alchemy laboratory established and operated by the Danish astronomer Tycho Brahe. It was the first custom-built observatory in modern Europe, and the last to be built without a telescope as its pr ...

. This observatory consisted of two large structures perched on a hill overlooking the European section of Constantinople and offering a wide view of the night sky. Much like a modern institution, the main building was reserved for the

library A library is a collection of Book, books, and possibly other Document, materials and Media (communication), media, that is accessible for use by its members and members of allied institutions. Libraries provide physical (hard copies) or electron ...

and the living quarters of the staff, while the smaller building housed a collection of instruments built by Taqi ad-Din. These included a giant armillary sphere and an accurate mechanical

astronomical clock An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the Sun, Moon, zodiacal constellations, and sometimes major planets. Definition ...

for measuring the position and speed of the planets. With these instruments, Taqi ad-Din had hoped to update the old astronomical tables describing the motion of the planets, sun, and moon. The observatory did not survive to advance the development of astronomy in the Muslim world. Within months of the observatory's completion, a

comet A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or Coma (cometary), coma surrounding ...

with an enormous tail appeared in the sky and Sultan Murad III demanded a prognostication about it from his astronomer. "Working day and night without food and rest" Taqi ad-Din studied the comet and came up with the prediction that it was "an indication of well-being and splendor," and would mean a "conquest of Persia". Unfortunately, instead of splendor, a devastating plague followed in some parts of the empire, and several important persons died. Astronomy was a respected and approved science among the Islamic clergy of the Ottoman Empire, yet the same could not be said with regard to astrology, a field which is considered to be

divination Divination () is the attempt to gain insight into a question or situation by way of an occultic ritual or practice. Using various methods throughout history, diviners ascertain their interpretations of how a should proceed by reading signs, ...

and thus against

sharia Sharia, Sharī'ah, Shari'a, or Shariah () is a body of religious law that forms a part of the Islamic tradition based on Islamic holy books, scriptures of Islam, particularly the Quran, Qur'an and hadith. In Islamic terminology ''sharīʿah'' ...

. In order to prevent its further use for astrological purposes, they successfully sought the observatory's destruction. This happened just as the king of Denmark built an observatory for

that would pave the way for

Kepler Johannes Kepler (27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music. He is a key figure in the 17th-century Scientific Revolution, best known for his laws of p ...

's elucidation of the orbits of planets.

Instruments

Taqi ad-Din wrote an important treatise on astronomical instruments entitled the ''Observational Instruments of the Emperor's Catalogue'', which describes the astronomical instruments used in the Constantinople observatory of Taqi ad-Din. These included

ancient Ancient history is a time period from the beginning of writing and recorded human history through late antiquity. The span of recorded history is roughly 5,000 years, beginning with the development of Sumerian cuneiform script. Ancient h ...

instruments such as the armillary sphere, paralactic

ruler A ruler, sometimes called a rule, scale, line gauge, or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. Usually, the instr ...

and

astrolabe An astrolabe (; ; ) is an astronomy, astronomical list of astronomical instruments, instrument dating to ancient times. It serves as a star chart and Model#Physical model, physical model of the visible celestial sphere, half-dome of the sky. It ...

; medieval Muslim instruments such as the universal astrolabe,

azimuth An azimuth (; from ) is the horizontal angle from a cardinal direction, most commonly north, in a local or observer-centric spherical coordinate system. Mathematically, the relative position vector from an observer ( origin) to a point ...

al and mural quadrants, and sextants; and several instruments he invented himself, including the ''mushabbaha bi'l manattiq'', a framed sextant with cords for the determination of the

equinox A solar equinox is a moment in time when the Sun appears directly above the equator, rather than to its north or south. On the day of the equinox, the Sun appears to rise directly east and set directly west. This occurs twice each year, arou ...

es similar to what

later used, and a wooden quadrant for measuring

s and elevations. His most important astronomical instrument, however, is the "observational clock", which in his ''In the Nabk Tree of the Extremity of Thoughts'', he describes as "a mechanical

clock A clock or chronometer is a device that measures and displays time. The clock is one of the oldest Invention, human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, a ...

with three dials which show the

hour An hour (symbol: h; also abbreviated hr) is a unit of time historically reckoned as of a day and defined contemporarily as exactly 3,600 seconds ( SI). There are 60 minutes in an hour, and 24 hours in a day. The hour was initially establis ...

s, the

minute A minute is a unit of time defined as equal to 60 seconds. It is not a unit in the International System of Units (SI), but is accepted for use with SI. The SI symbol for minutes is min (without a dot). The prime symbol is also sometimes used i ...

s, and the

second The second (symbol: s) is a unit of time derived from the division of the day first into 24 hours, then to 60 minutes, and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of U ...

s. We divided each minute into five seconds." This was used for measuring the

right ascension Right ascension (abbreviated RA; symbol ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the equinox (celestial coordinates), March equinox to the (hour circle of the) point in questio ...

of the

star A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...

s. This is considered one of the most important innovations in 16th century practical astronomy, as at the start of the century clocks were not accurate enough to be used for astronomical purposes. Sevim Tekeli, "Taqi al-Din", in

Helaine Selin Helaine Selin (born 1946) is an American librarian, historian of science, author and book editor. Career Selin attended Binghamton University, where she earned her bachelor's degree. She received her MLS from SUNY Albany. She was a Peace Corps ...

(2008), ''Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures'', Springer, (print), (online.) A "remarkably modern-looking" terrestrial

globe A globe is a spherical Earth, spherical Model#Physical model, model of Earth, of some other astronomical object, celestial body, or of the celestial sphere. Globes serve purposes similar to maps, but, unlike maps, they do not distort the surface ...

of the

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

, one of the earliest of its kind, was constructed by Taqi ad-Din at the Constantinople observatory of Taqi ad-Din.

Observations

Taqi ad-Din made use of his new "observational clock" to produce a

zij A ' () is an Islamic astronomical book that tabulates parameters used for astronomical calculations of the positions of the sun, moon, stars, and planets. Etymology The name ''zīj'' is derived from the Middle Persian term ' or ' "cord". Th ...

(named ''Culmination of Thoughts in the Kingdom of Rotating Spheres'') more accurate than his predecessors,

and

Nicolaus Copernicus Nicolaus Copernicus (19 February 1473 – 24 May 1543) was a Renaissance polymath who formulated a mathematical model, model of Celestial spheres#Renaissance, the universe that placed heliocentrism, the Sun rather than Earth at its cen ...

. Taqi ad-Din was also the first astronomer to employ a

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notation in his

observation Observation in the natural sciences is an act or instance of noticing or perceiving and the acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the percep ...

s rather than the

sexagesimal Sexagesimal, also known as base 60, is a numeral system with 60 (number), sixty as its radix, base. It originated with the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians, and is still used—in a modified fo ...

fractions used by his contemporaries and predecessors. He also made use of

Al-Biruni Abu Rayhan Muhammad ibn Ahmad al-Biruni (; ; 973after 1050), known as al-Biruni, was a Khwarazmian Iranian scholar and polymath during the Islamic Golden Age. He has been called variously "Father of Comparative Religion", "Father of modern ...

's method of "three points observation". In ''The Culmination of Thoughts in the Kingdom of Rotating Spheres'', Taqi ad-Din described the three points as "two of them being in opposition in the

ecliptic The ecliptic or ecliptic plane is the orbital plane of Earth's orbit, Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. Fr ...

and the third in any desired place on the ecliptic. He used this method to calculate the

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

of the Sun's orbit and the annual motion of the

apogee An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values. Apsides perta ...

, and so did Tycho Brahe and Copernicus shortly afterwards, though Taqi ad-Din's values were more accurate, due to his observational clock and other more accurate instruments.

History

Instruments

Observations

See also

References

Further reading