Andronicus of Cyrrhus

Short description: Greek astronomer

The Tower of the Winds, Athens

Andronicus of Cyrrhus or Andronicus Cyrrhestes (Latin; Ancient Greek: Ἀνδρόνικος Κυρρήστης, Andrónikos Kyrrhēstēs; fl.

Short description: Latin loanword meaning "approximately, around"

CA|other uses of "Cca"|CCA (disambiguation)|CCA|other uses of "Circa"|Circa (disambiguation)}}Template:TWCleanup2Circa (from la 'around, about, roughly, approximately') - frequently abbreviated ca. or c. and less frequently circ., cca. or cc. - signifies "approximately" in several European languages and is used as a loanword in English, usually in reference to a date.[1] Circa is widely used in historical writing when the dates of events are not accurately known.

When used in date ranges, circa is applied before each approximate date, while dates without circa immediately preceding them are generally assumed to be known with certainty.

## Contents

* 1 Examples
* 2 See also
* 3 References
* 4 External links
* 5 Life
* 6 Work
* 7 References
* 7.1 Citations
* 7.2 Bibliography
* 8 External links

## Examples

* 1732–1799: Both years are known precisely.
* c. 1732 – 1799: The beginning year is approximate; the end year is known precisely.
* 1732 – c. 1799: The beginning year is known precisely; the end year is approximate.
* c. 1732 – c. 1799: Both years are approximate.

## See also

* Floruit

## References

1. ↑ "circa". Dictionary.com. http://dictionary.reference.com/browse/circa.

## External links

* v
* t
* e

Chronology

Key topics|

* Archaeology
* Astronomy
* Geology
* History
* Big History
* Paleontology
* Time

* Periods
* Eras
* Epochs

| Calendar eras|

* Human Era
* Ab urbe condita
* Anno Domini / Common Era
* Anno Mundi
* Byzantine era
* Seleucid era
* Spanish era
* Before Present
* Hijri
* Egyptian
* Sothic cycle
* Hindu units of time (Yuga)
* Mesoamerican
* Long Count
* Short Count
* Tzolk'in
* Haab'

|

Regnal year|

* Canon of Kings
* Lists of kings
* Limmu

Era names|

* Chinese
* Japanese
* Korean
* Vietnamese

Calendars|

| Pre-Julian / Julian|

* Pre-Julian Roman
* Original Julian
* Proleptic Julian
* Revised Julian

|

Gregorian|

* Gregorian
* Proleptic Gregorian
* Old Style and New Style dates
* Adoption of the Gregorian calendar
* Dual dating

Astronomical|

* Lunisolar
* Solar
* Lunar
* Astronomical year numbering

Others|

* Chinese sexagenary cycle
* Geologic Calendar
* Hebrew
* Iranian
* Islamic
* ISO week date
* Mesoamerican
* Maya
* Aztec
* Winter count (Plains Indians)

Astronomic time|

* Cosmic Calendar
* Ephemeris
* Galactic year
* Metonic cycle
* Milankovitch cycles

Geologic time|

| Concepts|

* Deep time
* Geological history of Earth
* Geological time units

|

Standards|

* Global Standard Stratigraphic Age (GSSA)
* Global Boundary Stratotype Section and Point (GSSP)

Methods|

* Chronostratigraphy
* Geochronology
* Isotope geochemistry
* Law of superposition
* Luminescence dating
* Samarium–neodymium dating

Chronological
dating|

| Absolute dating|

* Amino acid racemisation
* Archaeomagnetic dating
* Dendrochronology
* Ice core
* Incremental dating
* Lichenometry
* Paleomagnetism
* Radiometric dating
* Radiocarbon
* Uranium–lead
* Potassium–argon
* Tephrochronology
* Luminescence dating
* Thermoluminescence dating

|

Relative dating|

* Fluorine absorption
* Nitrogen dating
* Obsidian hydration
* Seriation
* Stratigraphy

Genetic methods|

* Molecular clock

Linguistic methods|

* Glottochronology

Related topics|

* Chronicle
* New Chronology
* Synchronoptic view
* Timeline
* Year zero
* Circa
* Floruit
* Terminus post quem
* ASPRO chronology

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BC) was a Macedonian astronomer best known for designing the Tower of the Winds in Roman Athens.

## Life

Little is known about the life of Andronicus, although his father is recorded as Hermias. It is usually assumed that he came from the Cyrrhus in Macedonia rather than the one in Syria.[1]

## Work

Andronicus is usually credited with the construction of the Tower of the Winds in the Roman forum at Athens around 50 BC, a considerable portion of which still exists.[2] It is octagonal, with figures of the eight principal winds (Anemoi) carved on the appropriate side.[3] Originally, a bronze figure of Triton was placed on the summit that was turned round by the wind so that the rod in his hand pointed to the correct wind direction, an idea replicated with subsequent wind vanes.[4] The interior housed a large clepsydra and there were multiple sundials on the exterior, so that it functioned as a kind of early clocktower.

He also built a multifaced sundial for the Temple of Poseidon on the island of Tinos.

## References

### Citations

1. ↑ "Biographies KYRROS (Ancient city) SYRIA - GTP - Greek Travel Pages" (in en). https://www.gtp.gr/LocInfo.asp?IncludeWide=1&InfoId=26&Code=MSY0ZZ00ALPALE81111&PrimeCode=MSY0ZZ00ALPALE81111&Level=10&PrimeLevel=10&LocId=63812&Entity=519.
2. ↑ "Andronicus of Cyrrhus | Greek astronomer" (in en). https://www.britannica.com/biography/Andronicus-of-Cyrrhus.
3. ↑ Noble & al. (1968), p. 353.
4. ↑ Chisholm (1911), p. 23.

### Bibliography

* This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed (1911). "Andronicus of Cyrrhus". Encyclopædia Britannica. 1 (11th ed.). Cambridge University Press. p. 976.
* Noble, Joseph V. et al. (1968), "The Water Clock in the Tower of the Winds", American Journal of Archaeology, 72 .

## External links

* Tenos island - Epigraphical Database - IG XII,5 891

* v
* t
* e

Ancient Greek astronomy

Astronomers|

* Aglaonice
* Agrippa
* Anaximander
* Andronicus
* Apollonius
* Aratus
* Aristarchus
* Aristyllus
* Attalus
* Autolycus
* Bion
* Callippus
* Cleomedes
* Cleostratus
* Conon
* Eratosthenes
* Euctemon
* Eudoxus
* Geminus
* Heraclides
* Hicetas
* Hipparchus
* Hippocrates of Chios
* Hypsicles
* Menelaus
* Meton
* Oenopides
* Philip of Opus
* Philolaus
* Posidonius
* Ptolemy
* Pytheas
* Seleucus
* Sosigenes of Alexandria
* Sosigenes the Peripatetic
* Strabo
* Thales
* Theodosius
* Theon of Alexandria
* Theon of Smyrna
* Timocharis

Works|

* Almagest (Ptolemy)
* On Sizes and Distances (Hipparchus)
* On the Sizes and Distances (Aristarchus)
* On the Heavens (Aristotle)

Instruments|

* Antikythera mechanism
* Armillary sphere
* Astrolabe
* Dioptra
* Equatorial ring
* Gnomon
* Mural instrument
* Triquetrum

Concepts|

* Callippic cycle
* Celestial spheres
* Circle of latitude
* Counter-Earth
* Deferent and epicycle
* Equant
* Geocentrism
* Heliocentrism
* Hipparchic cycle
* Metonic cycle
* Octaeteris
* Solstice
* Spherical Earth
* Sublunary sphere
* Zodiac

Influences|

* Babylonian astronomy
* Egyptian astronomy

Influenced|

* Medieval European science
* Indian astronomy
* Medieval Islamic astronomy

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