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Four new astronomically related properties have been inscribed on the World Heritage List at the 45th (2023) session of the World Heritage Committee, held in Riyadh, Saudi Arabia, in September 2023:
Eise Eisinga planetarium, Netherlands
This moving mechanical scale model of the solar system is built into the ceiling and wall of the home of an ordinary citizen—its creator, Eise Eisinga, a Frisian wool-comber. Powered by a single pendulum clock, it provides a realistic image of the positions of the Sun, the Moon, the Earth, and the five planets Mercury, Venus, Mars, Jupiter and Saturn. The planets revolve around the Sun in real time and the distances between the planets are to scale.
Built between 1774 and 1781, and still in its original state, this remarkable orrery represents one of the earliest predecessors of the ceiling and projection planetariums of the 20th and 21st centuries.
Prehistoric sites of Talayotic Menorca, Spain
This serial (multi-site) property includes several taulas, arrangements of two large stone slabs bult into a “T”=shape enclosed within a walled enclosure, and facing its entrance. Constructed during the Bronze Age, these enigmatic monuments have a tightly clustered pattern of orientation around due south, apparently relating to the Southern Cross and other stars in the constellation Centaurus.
Hopewell ceremonial earthworks, Ohio, USA
The custom of mound building was widespread in eastern North America prior to European contact, and the Hopewell assemblage is characterized by enormous enclosures in the shape of circles, squares, and other clear-cut geometrical shapes, generally thought to have been built between about 200 BC and AD 400. A number of these include solstitial alignments: for example, along the diagonal axis of several square earthworks such as Hopeton, Hopewell, and Mound City, all of which are components of the serial property.
Many of the Hopewell earthworks have a fourfold symmetry and are cardinally or solstitially aligned. It has been suggested that circles and squares (or octagons) might themselves represent the earth and sky. When conjoined, as at Newark, they may have represented the whole universe in microcosm, defining spaces in which ceremonies or other activities could be performed that were suited to each realm.
Kazan and Engelhardt astronomical observatories, Russian Federation
Kazan Observatory was built in 1837 while Engelhardt Astronomical Observatory followed in 1898–1901. Its architecture and instrumentation reflects and represents the transition from classical astronomy to modern astrophysics.
Chankillo is inscribed on the World Heritage List
The prehistoric solar observatory and ceremonial centre at Chankillo in Peru, including its famous thirteen towers, has been inscribed on the World Heritage List at the 44th (2021) session of the World Heritage Committee, held in Fuzhou, China, and on-line.
What has been hailed as the oldest solar observatory in the Americas is the second case study on this portal to have been inscribed on the World Heritage List in the last three years, following the successful inscrption of Risco Caído and the sacred mountains of Gran Canaria (Spain) in 2019. While that cultural landscape contained two important archaeoastronomical sites, Chankillo is the first property on the List to have been inscribed specifically as an “archaeoastronomical complex”.
According to UNESCO’s brief synthesis:
“The Chankillo solar observatory and ceremonial centre is a prehistoric site located on the north-central coast of Peru, in the Casma Valley, comprising a set of constructions in a desert landscape that, together with natural features, functioned as a calendrical instrument, using the sun to define dates throughout the seasonal year.
“The property includes a triple-walled hilltop complex, known as the Fortified Temple, two building complexes called Observatory and Administrative Centre, a line of thirteen cuboidal towers stretching along the ridge of s hill, and the Cerro Mucho Malo that complements the Thirteen Towers as a natural marker.”
Chankillo has been inscribed under criteria (i) and (iv), as follows:
Criterion (i): “Chankillo archaeoastronomical complex is an outstanding example of ancient landscape timekeeping, a practice of ancient civilizations worldwide, which used visible natural or cultural features. Incorporated in the Thirteen Towers, it permitted the time of year to be accurately determined not just on one date but throughout the seasonal year. Unlike architectural alignments upon a single astronomical target found at many ancient sites around the world, the line of towers spans the entire annual solar rising and setting arcs as viewed, respectively, from two distinct observing points, one of which is still clearly visible above ground. The astronomical facilities at Chankillo represent a masterpiece of human creative genius.”
Criterion (iv): “Chankillo was in use for a relatively brief period of time between 250 and 200 BC, during a late phase of the Early Horizon Period (500–200 BC) of Peruvian prehistory, after which it was destroyed and abandoned. The Chankillo Compex is a very particular type of building representing an early stage in the development of native astronomy in the Americas. It shows great innovation by using the solar cycle and an artificial horizon to mark the solstices, the equinoxes, and every other date within the year with a precision of 1–2 days. The solar observatory at Chankillo is thus a testimony of the culmination of a long historical evolution of astronomical practices in the Casma Valley.”
We are 10 years old!
The Portal to the Heritage of Astronomy was launched 10 years ago at the IAU’s 28th General Assembly in Beijing, China, on 24 August, 2012. READ THE ORIGINAL PRESS RELEASE HERE
Thematic Study published in Japanese
Thanks to the efforts of translators Reizaburo Kitai, Hiroko Watanabe and Kumi Hirose, the ICOMOS–IAU Thematic Study on the Heritage Sites of Astronomy and Archaeoastronomy is now available in Japanese.
This Japanese version of the Thematic Study has been published by ICOMOS and can be downloaded free of charge.
Download the new Japanese edition (2022) [38Mb] 
Download the original English edition (45Mb)
For further information on the two ICOMOS–IAU Thematic Studies on astronomical heritage, see here.