December 27, 1571, Johannes Kepler, astronomer, was born in Wüttemberg (Germany).

On this day (December 27), 1571, in Wüttemberg (Germany), Johannes Kepler, an astronomer, was born.
he was introduced to astronomy at a young age and developed a lifelong passion for it. At age six, he observed the Great Comet of 1577 , writing that he "was carried by [his] mother to a high place to look at it". In 1580, at the age of nine, he observed another astronomical event, a lunar eclipse , recording that he remembered being "called out into the open" to see it and that the moon "seemed quite red".
In 1589, after passing through the primary school, the Latin school and the seminary at Maulbronn Kepler attended Tübinger Stift at the University of Tübingen . There, he studied philosophy with Vitus Müller and theology with Jacob Heerbrand
he became Copernican at that time. In a student dispute, he defended heliocentrism from both a theoretical and theological perspective, arguing that the Sun was the main source of power engine in the universe.
Kepler's first major astronomical work, Mysterium Cosmographicum ( The Cosmographic Mystery , 1596), was the first published defense of the Copernican system.
The extensive line of research that culminated in Astronomia Nova ( A New Astronomy )—including the first two laws of planetary motion— began with the analysis, under the Tycho direction, from the orbit of Mars.
Since completing Astronomia Nova , Kepler had intended to write an astronomy textbook that would cover all the fundamentals of heliocentric astronomy . Kepler spent the next several years working on what would become Epitome Astronomiae Copernicanae ( Epitome of Copernican astronomy).
As a curiosity to comment that like Ptolemy, Kepler considered astrology as the counterpart of astronomy and had the same interest and value . However, in the years that followed, the two subjects grew apart until astrology ceased to be practiced among professional astronomers.
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- This telescope is very good
- I see Mars very well
- all the details are visible
- looks pretty good
- and that mountain?
- which mountain?
- The one I see through the telescope
- let's see, let me see through the telescope
- take, look
- hey
- tell me, what mountain is it?
- that's not Mars
- huh? right?
- no, it's the Moon
- well I'm disappointed with the telescope
- still very good
- no big deal

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