Sundials - World's Oldest Clocks

North American Sundial Society

Horizontal Gnomonic Dial (Inv. 3075)
by permission
Museo Archeologico Nazionale di Napoli
Statuette of Atlas Bearing a Hemispherical Sundial
by permission
Sir John Soane's Museum, London

The Institute for the Study of the Ancient World  (15 East 84th Street in New York) is hosting an exhibition "Time and Cosmos in Greco-Roman Antiquity" open to the public from now until April 23, 2017.  From their on-line invitation, "This exhibition aims to explore the ways that time was organized and kept track of in the Greco-Roman world, and how it was conceived in relation to the Cosmos. The objects displayed include artifacts illustrating the technology of ancient time-reckoning and the perception, visualization, and social role of time and cosmos..."  This is exemplified by a wonderful horizontal gnomonic sundial using a vertical gnomon shown at left.  It was found at Pompeii around 1865 and became part of the Museo Archeologico Nazionale di Napoli in 1867. "Despite the fact that it was found in Italy, the inscriptions on it are in Greek, perfhaps reflecting the status of Greek as the langauage of science in antiquity. The summer and winter tropics (solstices), equinox, and seasons are reasonably declined.  The hour lines however reflect temporal hours rather than the hour angles we would draw  todayl.

Read more: Time and Cosmos

Athens Tower of WindsIn the old Roman Agora on the slope of Athen's ancient Acropolis hill is the Tower ofWinds.  Today, completing two years of restoration, the interior was re-opened to the public this summer in August, 2016. The Tower had been closed for the last 200 years.  The story of the Tower starts in the first century, BCE, probably during the reign of Julius Caesar.

The Tower was designed by Andronikos Kyrrhestos (Andronicus of Cyrrhus), an astronomer and maker of celestial instruments. Andronicus constructed a white marble sundial for the sanctuary of Poseidon and Amphitrite on the island of Tinos.  The sundial becamse so famous that Andronicus was invited to Athens where he erected the magnificent 14 meter Tower called the Aerides (the Winds) . It was built on the eastern side of the Roman Agora in Athens and meant to have utilitarian value. "No one knows who funded its lavish construction - the octagonal monument is made almost entirely of Pentelic marble, the same used for the Parthenon and rarely found in buildings other than temples," said Stelios Daskalakis, head conservator.

Atop of the octogon tower now rests the fully-preserved roof made of 24 marble slabs, resting on a Corinthian capital. Once a bronze statue of Trition, the god of the sea, was set on the roof to turn in the wind as a weather indicator.  By night, water flowed through a hydro-mechanical system designed by Andronicus from a cylinder inside the Tower.  The water level lead to an exterior indicator creating a night time clock or  clepsydra. During the day the Tower was a public time teller with eight sundials.

Attachments:
Download this file (NASS_Theodossiou_Tower_of_Winds.pdf)NASS_Theodossiou_Tower_of_Winds.pdf[ ]960 kB

Read more: Athens Tower of Winds Opens to Public

Mosaic at Antioch

The Daily Sabah reports a 2,400 year old mosaic discovered during excavations in Turkey's southern Hatay provice that shows a skeleton that according to archeologist Demet Kara fromthe Hatay Archeology Museum has an inscription that translates from ancient Greek to say "Be cherrful, and live your life."

Perhaps more interesting to sundialists is the mosaic further right.  It is of a Roman attending the bath. Demet Kara explains, "...there is a sundial and a young clothed man run[s] towards it with a bare-headed butler behind.  The sundial is between 9 and 10 am.  9am is the bath time in the Roman period.  He has to arrive at supper at 10am.  Unless he can, it is not well received.  There is writing on the scene that reads he is late for supper and writing about time on the other."

Kara added, "[This is] a unique mosaic in Turkey.  There is a similar mosaic in Italy but this one is much more comprehensive.  It is important for the fact that it dates back to the third century BCE...Antiocheia was a very important, rich city. There were mosaic schools and mints in the city. The ancient city of Zeugma in [the southeastern province of] Gaziantep might have been established by people who were trained here. Antiocheia mosaics are world famous."

http://www.dailysabah.com/nation/2016/04/22/2400-year-old-mosaic-found-in-southern-turkey-says-be-cheerful-enjoy-your-life

http://www.hurriyetdailynews.com/be-cheerful-live-your-life-ancient-mosaic-meme-found-in-turkeys-south.aspx?PageID=238&NID=98201&NewsCatID=375

Larisa N. Vodolazhskaya of the Department of Space Physics at Southern Federal University (SFU), Rostov, has brought two ancient time keepers together with a new and startling result.  The story starts at the turn of the end of the 19th century with the discovery of an L-shaped bar found in the tomb of Thutmose III (1479-1425 BCE). that appeared to be a sundial. In the 1930's a "user manual" of sort was found carved on the tomb ceiling of Seti I (1290-1279 BCE) at Abydos. The ideal L-shaped bar had lines engraved with distances from a starting mark of  3, 6, 9, and 12 units. The Seti I text describes these spacings as "an established procedure".  But what is the procedure?

Read more: New Insights into Ancient Sundials

Kanaloa Stone Shadows
Kānaloa Stone Shadow Alignment
Photo: Kaho'olawe Island Reserve Commission

On Kaho'olawe, the smallest island of the Hawaiian island chain only 7 miles from Maui, sits an endangered and sacred rock, the Kānaloa, with petroglyphs and a row of 32 cupules (man-made depressions) along one edge. “It has significant celestial alignments with the rising and setting of the sun,” said Michael Naho'opi'i, Executive Director of the Kaho'olawe Island Reserve Commission (KIRC). It appears that there is a relationship between the shadow of a stick held vertically along lines etched in the stone and the cupules.

Documented as Site 110 feature BU, the Kānaloa stone is relatively flat and rests on a natural pedestal that when tapped, resonates with a bell-like ring. But its petroglyphs and alignment cups may soon topple into a nearby and ever growing ravine. In 2010 the Commission approved "The Cultural Use Plan: Kūkulu Ke Ea A Kānaloa" with one of the recommendations to preserve and stabilize the stone. The first phase of the plan has been to document the stone's celestial alignments and quantify the erosion forces acting on its base.

Read more: Kanaloa Stone Endangered

nass_news_2014_jun_al-Biruni_cosmos
Al-Biruni's diagram of the moon's phases. 
Credit: photo reproduction from Seyyed Hossein Nasr, Islamic Social Science: An Illustrated Study (World of Islam Festival Publishing Co., 1976). 
Photo use for non-profit educational purposes only.

Ibn al-Shatir, whom we give credit for inventing the first modern sundial with gnomon pointing to the celestial pole in 1371 C.E., is but one of many scientific scholars of Central Asia during the “Eastern Renaissance” that lasted from about 800 to 1500 C.E. In this week’s issue of Science, [20 June 2014] Richard Stone reviews the accomplishments of Abu Rayhan al-Biruni (born 973 C.E.) and the possibility that he "discovered" the American continent.

Situated at the crossroads of cultures from China, India, the Middle East, and Europe, al-Biruni was an acomplished astronomer at an early age.  At 16 he measured the height of the midday sun and calculated the latitude of his hometown, now in present day Khiva, Uzbekistan.

Read more: al-Biruni's Cosmos