Birth of Nicolaus Copernicus 

US #1488 was issued for Copernicus’ 500th birthday.

Nicolaus Copernicus was born on February 19, 1473, in Thorn, Poland.

The youngest of four children, Copernicus attended the University of Krakow where he studied math, philosophy, and astronomy. Though he attended for four years, Copernicus didn’t earn a degree.

US #1488 – Silk Cachet First Day Cover.

Copernicus left the school in 1495 at his uncle’s request. His uncle was Prince-Bishop of Warmia and wanted his nephew to study cannon law in Italy. The following year he traveled to Bologna to begin his studies. He remained there for three years but was more interested in the humanities than the priesthood and took a particular interest in astronomy. During this time he met noted astronomer Domenico Maria Novara da Ferrara and soon became his student and assistant.

Tunisia #616 was also issued for Copernicus’ 500th birthday.

Copernicus aided Ferrara in his astronomical observations and began making observations of his own, verifying previous studies of the Moon’s motion, witnessing a lunar eclipse, and studying the planets. He eventually completed his doctorate on cannon law and then studied medicine. By the time he was 30, Copernicus had completed all of his studies in Italy and returned home to Warmia. There he served as his uncle’s secretary and doctor. Living in the bishop’s castle, Copernicus began working on his heliocentric theory that the planets revolved around the Sun. He continued to work as a canon (priest) for the rest of his life, using his free time to study the sky.

At the time, it was believed the Earth was the center of the universe and all other heavenly bodies moved around it. One of the major problems with this belief was that the planets would occasionally travel backwards across the sky. Astronomers called this retrograde motion and followed Ptolemy’s model. According to this model, the planets traveled on epicycles – circles within circles – but that seemed too complicated to be a natural occurrence.

US #1488 – Plate Block First Day Cover.

Copernicus secretly questioned this belief and conducted his own observations and developed a new theory, possibly around 1508. Then around 1514, he distributed a handwritten book called “Little Commentary” to his friends. The book described his theory that the sun was the center of the universe, and all the planets revolve around it. He also thought the Earth rotated daily on an axis, rather than remaining motionless.

Togo #C201a pictures Copernicus and his model of the solar system.

Throughout the remainder of his life, Copernicus gathered more data, but would not publish it because he was worried about the ridicule “to which he would expose himself on account of the novelty and incomprehensibility of his theses.” His book, On the Revolutions of the Celestial Spheres, was finally published two months before his death. He died on May 24, 1543. Many years later, Johannes Kepler was deeply inspired by Copernicus and would expand and improve on his observations, helping to popularize the heliocentric model.

Click here to see what else happened on This Day in History.


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  1. Copernicus was reluctant to publish his revolutionary ideas for more reasons than just facing radicle. He feared that he might be excommunicated from the church or even executed as a heretic. Times have changed, of course, but look at the people today who doubt, ridicule, and refuse to accept the findings of scientists that establish that global warming is primarily caused by human activities. And some of those doubters are in positions of power and could actually do something about it.

    1. I think you could find just as many scientists who deny human activities cause warming. We’re like ants compared to the universe.

      1. You’re wrong there, Valorie. Something like 97-98% of the climate scientists support human activities as the primary cause of the rapid global warming that is occurring. The few who disagree usually are in the employ of one of the oil companies like Exxon-Mobil or Shell. The “ants” you refer to are the 6 or 7 billion humans that occupy planet earth. It’s true that we aren’t changing the universe, but we sure are changing the earth.

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