Archaeoastronomy

Source: Stonehenge at Sunset

Archaeoastronomy is the study of ancient astronomical practices, specifically how they “have understood the phenomena in the sky, how they used these phenomena and what role the sky played in their cultures.” Back in ancient times, there was obviously no technology, but people wanted to understand the natural world. They saw amazing sights (planets, stars, weather, etc.) and wanted to figure out what was going on (rightfully so)! Ancient people all across the globe created structures in order to estimate the positions of objects in the sky, like the Sun, the Moon, stars, and constellations. They tracked constellations’ time of year so they knew when to plant crops and harvest them. The Sun and constellations were used for navigation, especially among sailors traveling by sea. Most notably, ancient civilizations interpreted astronomical patterns as cultural signs. They built incredible structures that were astronomically aligned. One of the most famous examples of archaeoastronomy ever discovered is pictured above. This structure is in Stonehenge, England. It is still unknown who built it and why, however, archaeoastronomers know that the builders used the megalithic structure like a giant calendar to predict the solstices, equinoxes, half-quarter days, and various lunar movements based on where the fun shines. Archaeoastronomers use archaeology, anthropology, astronomy, statistics and probability, and history to discover ancient practices.

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Historical Astronomers in Context

Nicolaus Copernicus

Nicholas Copernicus lived from February 19, 1473 to May 24, 1543. He was one of the first people to propose the Heliocentric Theory, which states that the Sun is the center of the solar system and everything else revolves around it. He also proposed that the Earth rotates on its axis and correctly predicted the order of the planets.

Another significant historical figure who lived during Copernicus’ lifetime was Leonardo da Vinci, who was born on April 15, 1452 and died on May 2, 1519. Although he is most widely known for painting the Mona Lisa and the Last Supper, he was also an inventor and engineer.

For context, one of the major events that happened during this time was that Christopher Columbus sailed across the Atlantic Ocean and ended up in the Bahamas in 1492. Later in 1521, closer to the end of Copernicus’ life, Martin Luther was excommunicated from the Catholic Church by Pope Leo X.

The part I found the most interesting when putting Copernicus’ life into historical context was when looking at the different events. I had previously thought that Christopher Columbus “discovering” America and Martin Luther being excommunicated happened much earlier than the proposal of the Heliocentric Theory. However, this made me realize how amazing his discoveries were given the limited knowledge and tools that he had at the time.

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Historical Astronomers in Context

I chose Nicholas Copernicus (1473 – 1543) for my Homework 3 assignment.

He lived during the inception of the Protestant Revolution (circa 1521), a religious conflict between Protestant reformers and the Catholic Church. In this same year, Ferdinand Magellan died during his attempted circumnavigation in the Pacific.

Martin Luther, a prominent leader of the Protestant Revolution (see above), lived concurrently to Copernicus, between the years 1483 and 1546. His publication, the “95 Theses” is largely recognized as the catalyst of the Reformation.

I found it interesting to discover how Copernicus’s religiously heretical theory of heliocentrism was chronologically aligned with a major change in the religious establishment itself. A layer of context is added to his decision to withhold his discovery from publication, despite having the support of his colleagues, until his death.

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Historical Astronomers in Context

Nicholas Copernicus:

Nicholas Copernicus was born February 19, 1473 and lived until May 24, 1543. Within his lifetime, he great contributions to astronomy that inspired many following astronomers, including Galileo, Kepler, and Newton, to test and prove some of the most fundamental aspects of our solar system.  Although it was not accepted at the time, Copernicus first proposed the heliocentric representation of the solar system (he believed this applied to all of the universe, since they had no idea how big that really was).  Despite the currently held belief that the Earth was the center with everything revolving around it, Copernicus took a jump to claim it was instead the Sun that we orbited.  He also proposed that the earth spins on its axis daily, gradually wobbles on its axis, and orbits the Sun in one year.  These discoveries proved to be integral to other astronomers learning even further how our solar system works.

Historical Events:

In 1492, Christopher Columbus finds land in what he believes to be East Asia.  He had attempted to find a way to reach Asia by boat in search of gold and spices, but instead he landed in the Caribbean and claimed the land for Spain.  

In 1503, Leonardo Da Vinci paints the Mona Lisa, which will go on to become one of the most widely recognized and critically acclaimed paintings of all time.  Even 500 years later, the painting is priceless, with people traveling from all over the world to see it.

Historical Figure:

Martin Luther was born on November 10, 1483 and lived until February 18, 1546.  He singlehandedly began the Protestant Reformation with the nailing of his 95 Theses to a chapel door.  Questioning the basis of Catholicism, he and his followers split from the Catholic Church and began a new line of Christianity, Protestant, with hopes of reforming from within.

Reflection:

I found it very interesting to look not just at the lives of some famous astronomers, but the historical context as well.  Although I knew about all of the events and people I read about, I had never before connected the dots that all of these things were happening at the same time.  When Copernicus was proposing the heliocentric model of the universe, Columbus was discovering the Americas, da Vinci was painting the Mona Lisa, and Martin Luther was beginning the Protest Revolution.  Piecing together that all of these pivotal events were happening at once puts into perspective just how long ago Copernicus made his discovery.  The fact that he was able to make the observations and predictions that he did, when the Americas had yet to be colonized and Catholicism was the only form of Christianity, just shows how forward thinking and ahead of his time he was.  Learning about astronomy in context really reveals how impressive these astronomical discoveries were.

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Historical Astronomers in Context: Nicolaus Copernicus

Nicolaus Copernicus (February 19, 1473 – May 24, 1543) was a huge contributor to the world of astronomy. Not only is he viewed as the father of modern astronomy, he created the heliocentric theory and model of the universe. He was the first scientist in the modern era to propose that Earth traveled around the sun, as well as the other planets in the solar system, as opposed to the wide belief that the sun and other planets orbited the Earth. He also proposed that Earth also turns on its axis daily in addition to orbiting the sun annually. Moreover, he argued that Earth wobbles slowly on its axis which contributes to the precession of the equinoxes.

During the same time that Copernicus was living, major events outside of astronomy occurred. One such event that is one of the most influential was “Age of Discovery” reaching the Americas in 1492. This happened due to Christopher Columbus (1451-1506) sailing across the Atlantic Ocean to Hispaniola, sparking the division of the “New World” by Spain and Portugal from 1492 to 1494. Another example is Martin Luther starting “The Protestant Reformation” in 1517. Luther, an Augustinian monk was angered by what he felt was the Catholic church’s corruption, as the pope participated in the sale of reprieves from atonement and indulgences. In protest, he wrote his “95 Theses” which inspired the creation of new churches, known as Protestant, that were more focused on the Bible readings and believers’ relationships with God. This started a wave of Lutheranism in Europe, and Protestantism in the form of many other new churches. It also was the catalyst for an intense struggle between the Catholics and Protestants that continues to this day, but with less violence now.

The major events couldn’t have happened without the figures at their centers. One famous figure who lived during Copernicus’s time is Leonardo da Vinci (1452-1519). Da Vinci was an Italian painter, sculptor, architect, and engineer from Anchiano, Republic of Florence (Italy) who is considered one of the most genius and creative people to have ever lived. He is most known for painting both The Last Supper (1495-98) and the Mona Lisa (c. 1503-19), which are some of the most famous paintings in the world.

Researching the context of the time period that Nicolaus Copernicus lived was very interesting to see. I liked the fact that this was an intense time period of human ingenuity even without new technological advancements. Copernicus developed his theories even knowing that he and his ideas would be attacked, much like Martin Luther and Lutheranism was by some. This even goes for da Vinci and his inventions. This exercise also gave me so much knowledge about this time which I had forgotten. I hadn’t realized that the heliocentric theory, Protestantism and da Vinci’s creations were all produced at around the same time. IT is truly incredible to think about. It provided really good comparisons that led to the conclusion that people are much more alike than we think, even if the context for each person is different. We are all creative in some type of way, it just depends on our passions and what we are willing to do to develop them.

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Historical Astronomers in Context

Galileo Galilei (February 15th, 1564 – January 8th, 1642)

Galileo Galilei’s contribution to the field of astronomy is well known around the world. The Italian-born polymath initially focused on mathematics and physics, but his studies moved him to the telescope. Galileo learned about and improved upon the telescope, significantly increasing its power, which allowed him to be the first to observe Jupiter’s four moons and Saturn’s rings. Learn more about these discoveries HERE. Lastly, Galileo’s work led him to be a primary supporter of heliocentrism, presented by Nicholas Copernicus. Using the observations he had from Jupiter’s moons, he could support Copernicus’s theory that the Earth and planets revolve around the Sun.

Events During Galileo’s Life

The King James Bible is a well-published English translation of the Christian Bible and was completed in 1611. The publication is the most popular translation of the Bible and contains 39 books of the Old Testament and 27 books of the New Testament. In all, this translation is considered one of the most influential books in English culture.

In 1630, Boston was founded by colonists from England. Home today to the New England Patriots and the Boston Celtics, John Winthrop was the Tom Brady of the 17th century as he was Boston’s first governor. Boston is the 21st largest city (by population) in the US and has been the center of many famous historical events during the American Revolution.

Famous People During Galileo’s Life

Famous in real life and in movies, Pocahontas was a Native American woman who, in 1613, was captured by Colonists from Jamestown, Virginia. During captivity, she began relations with the Colonists of Jamestown and married John Rolfe, and while doing so, assisted the settlers in adjusting to life in North America. There is also a really cool Disney movie about Pocahontas (Disney+ highly recommended), most of which is fiction but still fun to watch.

Reflection

As I was researching things that happened during Galileo’s life, I realized two things: Galileo was really important and he made his discoveries a long time ago. For the former, as I was looking through timelines of the late 16th century and the first half of the 17th century, much of the key events that occurred can be contributed to Galileo (or one of the trio of Kepler, Brahe, and Galilei). As for the latter, looking along the timeline of events and seeing things like the Americas being settled made me realize that the things Galileo was doing with a telescope were revolutionary for the time. Using Boston being founded or Pocahontas as context, I further understood the time between then and now and how far astronomy has come in that time

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Historical Astronomers in Context

Johannes Kepler (1571-1630) was important to astronomy since he came up with three laws to describe planetary motion (Kepler’s laws of planetary motion). The first law states that planets have elliptical orbits with the Sun at one focus of the ellipse while the other focus is just empty space. This is significant because previous astronomers thought the planets had perfect, circular orbits. The second law or “area law” states that a planet sweeps out equal areas in equal times during its orbit. This means that planets will move faster in its orbit when closer to the Sun and slower in its orbit when farther away from the Sun. The third law or “harmonic law” states that the square of a planet’s orbital period in years is equal to the cube of the semimajor axis (planet’s average distance from the Sun) in astronomical units (AU).

There are a few major historical events that occurred during Kepler’s lifetime. In 1614, John Napier developed logarithms. He designed a table which conveyed powers of a fixed number used as a base; this table could be used to calculate different roots, products, and quotients. This discovery of logarithms was important since they simplified calculations that could be considered long and tedious. In 1620, approximately 100 Pilgrims arrived in Plymouth, Massachusetts on the Mayflower ship. This event was significant since it was the first long-term New England colony. Additionally, some of the group leaders wrote the Mayflower Compact which indicated the structure of one of the first governments created.

William Shakespeare was a famous historical figure in literature that lived during the same time period as Johannes Kepler. Shakespeare was born in April 1564 and died on April 23, 1616. His birthday is not entirely known, but it is usually celebrated on April 23rd. Shakespeare was an English poet who wrote approximately 37 plays and 154 sonnets. He is an important historical figure because his works, such as Romeo and Juliet and Hamlet, are still being read and performed in numerous countries all over the world.

 After completing this research, it was interesting to see a connection between Shakespeare, Kepler, and the Pilgrims. It so intriguing to me that all these significant historical figures were alive around the same time. Additionally, I had not heard much about Kepler and his discoveries before, so I was glad to learn more about his contributions to astronomy. Particularly, Kepler’s first law was interesting to me because I did not know that ancient astronomers thought that the planets had circular orbits since I just remember growing up learning that the planet’s orbits were elliptical. I am also in amazement at the mathematical relation Kepler was able to determine in his third law because I can only imagine all the effort and time he put into various calculations to come up with this equation that was quite revolutionary. 

Portrait of Johannes Kepler (taken from Britannica)

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Historical Astronomers in Context

My chosen astronomer is Johannes Kepler. Kepler was born on December 27, 1571 and died on November 15, 1630. Kepler is mainly credited for establishing his three laws about planetary motion and orbits.

Two major historical events that occurred during Kepler’s lifetime were the founding of Jamestown settlement and the start of the Thirty Years War. Jamestown, which was founded in 1607, was the first permanent English settlement the New World. The Thirty Years War, which began in 1618, was famous because of its longevity and amount of casualties. The war was began as a conflict between the Catholics and the Protestants before extending further into Europe.

A historical figure alive during Kepler’s lifetime was William Shakespeare (1564-1616). Shakespeare, a famous poet and playwright, has written hundreds of different works, many of which are still commonly known today.

It was really interesting to learn a little more about famous astronomers, and the times they lived in. Having an idea of when these astronomers lived can help us contextualize what we learn about in class in terms of the day and age during which they lived. I liked being able to draw in people and events from other subjects, which helps to create a broader personal timeline of history in multiple fields. I also feel that it’s easier to understand the hesitations, resistance, developments, etc. in the astronomical world when there’s a context of what the world might have looked like and been thinking then!

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Historical Astronomers in Context

Nicholas Copernicus: Born: February 19th, 1473 Death: May 24th, 1543

Copernicus was an influential figure for astronomy because of his work in promoting the heliocentric model that ultimately led to the Copernican Revolution. While Aristarchus first proposed a sun centered model, Copernicus’ work in De Revolutionibus Orbium Coelestium signified a change from a Ptolemaic model to a heliocentric one. Copernicus’ work and ideas and models laid the foundations for the work of Kepler and Galileo, who ultimately proved that the Earth did revolve around the sun. In summary, Copernicus set in motion the work that would ultimately overturn the Ptolemaic model.

Events During Copernicus’ Life:

In 1492, Christopher Columbus “discovers” the New World when he lands in North America from Spain. This voyaged marked the beginning of a power struggle between European powers on a new frontier, the genocide of Native Americans, and creation of the triangle trade.  

In 1517, Martin Luther posts his Ninety-Five Theses in Germany, protesting against indulgences among other wrongdoings he saw within the Roman Catholic Church. The spread of Luther’s ideas ultimately lead to the Reformation within Christianity. 

Important Figure During Copernicus’ Life:

Michelangelo was an artist who lived from March 6th, 1475 to February 18th, 1564. He was one of the most influential artists of all time, and many of his works including David, the Ceiling of the Sistine Chapel, and the Last Judgement, are some of the most recognized icons in the world. 

Reflection:

After researching the context of Copernicus’ life, it is clear that he lived during the height of the Renaissance. There was great change in all aspects of life at the time, not only in art and religion as highlighted above, but also in politics, literature, and science. There was intellectual and cultural growth everywhere, so it makes sense that a shift from a geocentric model to a heliocentric one would happen during this time. There was clearly a pursuit for intellect and knowledge in Europe, and I believe this definitely had an impact for the observations Copernicus made. It reminds me a little of the Salk Institute in San Diego, in that if you are surrounded by great minds, there is positive synergy. Just by going through the list of historical figures who were alive with Copernicus, it really puts into perspective the minds in Europe at the time. From Machiavelli to Raphael, the list could go on. The 16th century really is a good breeding ground for ‘radical’ ideas and beliefs that still influence our world today. If I could go back in time, this time period certainly wouldn’t be a bad place to start.  

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Historical Astronomers in Context

Galileo Galilei was born on February 15th, 1564 and died on November 15th, 1630. Galileo, operating in a world of general ignorance surrounding the concepts of physics, is held as the father of modern physics. His early (and somewhat rough) discoveries in astronomy solidified the idea that the sun was the center of our universe—not Earth. This was mostly supported by his findings that Venus experienced phases similar to the moon and that the sun had spots.

During Galileo’s lifetime, Mary, Queen of Scotts, was ordered to be executed by Queen Elizabeth I in 1587. Also during his lifetime, Tycho Brahe explained his discoveries in astronomy during 1598.

William Shakespeare was alive during Galileo’s lifetime. William Shakespeare was…William Shakespeare, need I say more? But seriously, he created a number of plays, poems, and other artistic works (though this is now up for debate as there is some speculation that the name Shakespeare was merely a pseudonym) that have become timeless staples—continuing to be studied, produced, and shared today.

Learning about past astronomers In this context, Galileo specifically, make it clear that there are some things in the universe that we will not be able to observe or comprehend until our sciences and technologies improve. This is somewhat daunting because it actualizes the fact that our knowledge is, in a sense, generationally restrained. Though we can assume to have knowledge of certain facts, it remains highly likely that something in the future will disprove what we now believe to be absolute.

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