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Our fascination with the cosmos—particularly the Sun, Moon, and stars—has always been profound. While monumental strides in astronomy were made by figures like Galileo and Copernicus, many other astronomers had spent millennia studying the movements of celestial bodies. Some of their ancient devices were so intricate that it took centuries for us to fully grasp their complexity.
10. Warren Field Calendar
The Warren Field calendar, though first spotted from the sky in 1976, wasn’t properly excavated by the National Trust for Scotland until 2004. Yet, it took nearly another ten years to realize its true significance—referred to as “the beginnings of recorded time” by an archaeological team from the University of Birmingham.
This calendar was composed of twelve pits, arranged in a 54-meter-long arc (roughly 180 feet). Each pit was aligned with a lunar month, with adjustments made for lunar cycles. A straightforward lunar calendar would have been inadequate, as the lunar cycle doesn’t neatly align with a natural year. Remarkably, the Warren Field pit system managed to account for this discrepancy some 6,000 years before Stonehenge was constructed.
When the pits were dug up, it was observed that the holes at both ends were the smallest in size. While the majority of the pits contained only rocks and burned remnants, the fifth and sixth pits seemed to have held posts at some point. Additionally, these two pits were misaligned with the rest. After examining the surrounding area, archaeologists realized that the lunar calendar’s design included a built-in reset feature. The system had been positioned at a point where the sunrise on the winter solstice would perfectly align with a break in the mountains now known as 'Slug Road Pass.' By using this moment as the reference, the ancient people could reset their lunar calendar and stay on track.
This was accomplished around 8000 BC, making the pit system roughly 5,000 years older than some of the earliest calendars discovered in the Middle East. Although such an achievement might typically be associated with agricultural societies, the civilization that constructed this ancient lunar calendar was actually a group of hunter-gatherers. It’s believed that they used it to track the movement of animals essential for their survival.
9. Al-Khujandi’s Mural Sextant
Not much is known about Abu Mahmud Hamid ibn al-Khidr al-Khujandi, other than the fact that he was a mathematician and astronomer from the region now encompassing Afghanistan, Turkmenistan, and Uzbekistan. However, what we do know is that he was the mastermind behind one of the largest astronomical instruments of his time—the mural sextant near Rayy. This mural was created on a 60-degree arc between two walls of a building. With a diameter of around 43 meters (140 feet), the arc was subdivided into degrees, and each degree was further divided into 360 parts. This made the mural not only an incredibly precise solar calendar but also the first device capable of measuring with such accuracy on a small scale.
Between the summer and winter solstices, the Sun moves 47 degrees across the sky. Al-Khujandi’s arc room featured a domed ceiling with a hole that allowed the Sun’s rays to strike the arc. His careful calculations enabled him to trace the Sun’s movement and determine his latitude. Although the building settled during his experiments, causing slight misalignment of the arc’s center, al-Khujandi’s groundbreaking work contributed to the creation of other instruments like the astrolabe.
Other attempts to create a massive arc also took place. Observatories built in the 13th and 15th centuries had far greater success in constructing accurate mural sextants, thanks to advancements in construction techniques that solved the problem of movement after the sextant was built.
8. The Volvelle And The Zodiac Man
Introduced to Europe at the close of the 14th century, the volvelle was an unusual astronomical instrument that became an essential tool for scientists and physicians. Comprising multiple layered circles of parchment, all connected by a central tie, the user could move the circles to calculate a wide range of phenomena, from the phases of the Moon and the position of the Sun to the zodiac. Different versions also existed, including one that indicated the time of night based on the stars' positions.
Today, we might consider the volvelle a clever, albeit outdated gadget. However, in its time, it was a significant status symbol. Printed on parchment, it was so expensive that only the wealthiest could afford their own. When the philosopher Ramon Llull first brought the device to Europe, many were initially wary, associating it with dark magic and believing it offered access to a sinister power. Over time, these fears faded, and the volvelle eventually became a common item in doctors' bags.
One of the core beliefs in medieval medicine was that the human body mirrored the universe on a smaller scale. Each part of the body was thought to be ruled by a specific planet, and as a result, early medical texts almost always included an illustration of the 'Zodiac Man.' This concept still persists today in certain references, such as Aries governing the head and Scorpio overseeing the genitals.
To interpret the Zodiac Man, doctors needed an efficient way to track the Moon’s position, which is why they carried volvelles. In theory, the Zodiac Man could help determine the ideal times for taking medicine or performing surgery, all based on celestial alignments. Unfortunately, due to their fragility, few volvelles have survived to the present day.
7. Ancient Sundials
Today, sundials are mostly seen as quaint garden ornaments, but in ancient times, they were essential tools for telling time and observing the Sun’s journey across the sky.
One of the earliest sundials was discovered in the Valley of the Kings in Egypt. Dating back to between 1550 BC and 1070 BC, this sundial is made of limestone with a semicircle etched on it, which is divided into 12 sections. Interestingly, it was found alongside workmen’s drawings, suggesting it may have been used to measure work hours or to symbolize the Sun god’s passage through the night and the underworld.
Shortly after the discovery of the Egyptian sundial, another one was found in Ukraine, buried with a man who lived between 3,200 and 3,300 years ago. It’s believed that he was sacrificed as a messenger to the gods and was interred with an analemmatic sundial. Unlike traditional sundials, an analemmatic sundial used a movable pillar known as a 'gnomon,' which was adjusted daily to track the Sun’s movement across the sky. This sundial also indicated that the Srubna people possessed geometric knowledge, allowing them to calculate latitudes and the varying angles of the Sun's position as they traveled north or south. The sundial found with the man was specifically calibrated for his latitude.
6. Nebra Sky Disk
Named after the German town where it was unearthed in 1999, the Nebra sky disk represents the oldest known depiction of the cosmos. It was found buried alongside a chisel, two axes, two swords, and two arm rings.
Although this Bronze Age burial site dates back approximately 3,600 years, researchers believe the artifacts could be even older. The disk, which clearly depicts the Sun, Moon, and some stars, has long been subject to various interpretations. It is commonly thought to represent the Sun and Moon at the center, with a half-circle strip beneath them, possibly symbolizing a sacred motif, and smaller circles marking stars in constellations like Orion, Andromeda, and Cassiopeia.
The Sun was regarded as the source of life, essential for our survival. The Moon, on the other hand, symbolized the passage of time. Generally, those who understood the Moon’s cycles held a higher status in society.
The identity of the disk's creators remains unknown. However, the arrangement of stars on the disk suggests that the makers were likely situated at the same latitude as Nebra, Germany. Additionally, the metal used for the disk has been traced to mines somewhere in Europe.
The two men who discovered the artifacts at the burial site did so without proper authorization. While such finds are automatically claimed by the government, the men sold the entire collection on the black market. It wasn’t until 2002 that an archaeologist was able to broker a meeting to buy the items, paying less than their estimated black market value of $590,000. In the end, the men were arrested, and the artifacts were sent to the Museum of Halle.
5. Chankillo Astronomical Complex
The Chankillo astronomical site in Peru is so intricate that its true purpose wasn’t uncovered until 2007, with the assistance of a computer program designed to align solar panels. Spanning 300 meters (980 ft) across a hilltop, the site features 13 towers arranged in a straight line.
As a fortification, the location was an odd choice, lacking both defensive advantages and basic resources like running water or food. However, when archaeologists discovered that one of the towers aligned with the sunrise on the summer solstice and another with the winter solstice, they began to suspect its true purpose as an astronomical site.
Constructed around 2,300 years ago, the towers represent the oldest solar observatory in the Americas. There are also designated vantage points to the east and west of the towers, allowing observers to track the Sun’s rise and set along the complex. Even though the Sun’s path has shifted by a fraction of a degree since the site was active, this ancient calendar can still pinpoint the day of the year with only a two-day margin of error.
Sadly, the enormous solar calendar at Chankillo is the sole remnant of its civilization. While it seems that the astronomical knowledge of its builders was passed down to the Inca, we know nothing else about this South American culture that predated the Inca by over 1,000 years. A comparable site, attributed to the Inca, has been discovered near Lake Titicaca, and it has provided archaeologists with clues to trace the evolution of Sun worship over centuries.
4. The Hyginus Star Atlas
Known also as the Poetica Astronomica, Hyginus’s star atlas was one of the earliest representations of the constellations. While its authorship is debated, it is often credited to Gaius Julius Hyginus, who lived between 64 BC and 17 AD. Others argue that the work shows similarities to another piece by Ptolemy, suggesting that a different Hyginus wrote the text more than a century later.
Regardless, when the Poetica Astronomica was reissued in 1482, it became the first printed work to present both the constellations and the stories and mythology behind them. While other star atlases provided more practical, mathematical data for navigation, the Poetica Astronomica offered a more imaginative, literary approach to the stars and their tales. Woodcuts depicted the number of stars in each constellation, overlaid with illustrations that supposedly showed the positions of those stars.
However, most of the illustrations were reversed from reality, which made the atlas ineffective for locating the constellations in the actual sky. Despite this, the book was an essential resource for creating more functional star atlases and for preserving the mythology of the constellations.
3. El CaracolChichen Itza
Chichen Itza was established sometime between 415 AD and 455 AD. Its uniquely shaped observatory stands as a remarkable oddity. While most astronomical devices were designed to track the stars or the Sun, El Caracol (meaning “the snail”) was dedicated to observing the movements of Venus.
The erratic pattern of Venus's appearances and disappearances perplexed astronomers for ages. For the Maya, Venus held sacred significance. Festivals, sacrifices, and even wars were aligned with the planet’s movements. Wars were even planned to begin when Venus rose in the sky. The planet symbolized good fortune, with coronations taking place during its appearance. Venus even determined the scheduling of games.
El Caracol served partially as a temple for the god Quetzalcoatl and also as a structure to track the enigmatic Venus. The observatory’s platforms and windows were designed to align with Venus's path, linking its movement to the worship of Quetzalcoatl and the changing of the seasons. Even the grand staircase leading to the observatory was constructed with Venus in mind, as it marks the planet’s northernmost point.
Spanish missionary records highlighted the significance of Venus and the Sun to the Maya. However, many of these accounts have been lost over time, leaving researchers still investigating the true purpose of El Caracol and other similar towers discovered across the Mayan region.
2. Armillary Sphere
With its concentric rings orbiting a central point, the armillary sphere was a distant cousin to the celestial globe. There were two primary types—observational and demonstrational. Ptolemy was one of the earliest to use one. The rings were segmented to allow movement, helping to determine both latitude and longitude.
Alongside astrolabes, armillary spheres were vital for navigation over the centuries. Curiously, these widely used instruments were surrounded by a sense of mystery. While it's thought to have been a collaboration between the Greek and Islamic cultures, the true origin of the armillary sphere remains unclear, as does the purpose of its demonstrational models. Due to the similarity of the armillary sphere to the celestial globe, many ancient astronomical texts could refer to either instrument. The rings of the armillary sphere were delicate, so there are few surviving examples.
The Whipple Museum in England possesses one believed to date back to the 1500s, and the Museum of the History of Science at Oxford holds one from 1588. One of the most fascinating uses of the armillary sphere came when Portugal established its kingdom of Brazil. The country was given both a flag and an emblem featuring armillary spheres. While Brazil changed their flag after independence, traces of the ancient astronomical device remain in the starry blue globe depicted on their modern flag.
1. The Celestial Globe
The celestial globe originates from a time when astronomers imagined the stars to be positioned on a globe that revolved around the Earth. As this celestial sphere turned, so did the stars. The globes crafted to represent this heavenly orb are truly awe-inspiring.
Some of the earliest celestial globes were created by the ancient Greeks, and the concept continued to captivate minds through the 16th century. The first printed globe resembling our modern versions was made by German scholar Johannes Schoner. He presented his creations as a pair—a celestial globe and a terrestrial one. Only two of Schoner's celestial globes remain today, each a masterfully crafted piece of art, illustrating the constellations as they would have appeared in the night sky across the globe.
The earliest known celestial globe dates back to around 370 BC. You’ve likely seen it without recognizing what it is. The Farnese Atlas, the iconic marble statue from 73 BC depicting Atlas holding the world on his shoulders, actually portrays this precise celestial globe. As astronomers expanded their knowledge of the stars, the globe evolved, becoming more detailed. The Farnese Atlas, however, presents the stars as they would have appeared over 2,000 years ago. But, similar to the Poetica Astronomica, there is a flaw with these globes. Created to be viewed from the outside, the constellations are reversed from the way we would see them today.
