# June 6, 1436 born in Franconia, Johann Müller Regiomontano, was an astronomer and mathematician.

On this day (June 6) in 1436, Johann Müller Regiomontano was born in Franconia, he was an astronomer and mathematician.
Johann Müller Regiomontano showed enormous talent from an early age and an amazing ability for mathematics.
At the age of eleven he enrolled at the University of Leipzig to study dialectics. Later he entered the University of Vienna (1450) where he studied mathematics, astronomy and cosmology. He was so quick to learn from it that when he finished his studies in 1452, the rules of the University required him to reach the age of 21 to obtain a bachelor's degree. For this reason he had to wait until he reached the required age in 1457.
Regiomontano's written work can be included in treatises on mathematics, centered on what is now called trigonometry (he is considered a founder of this part of mathematics) and treatises on astronomy.
On the other hand he describes and invents several useful instruments for the observation and measurement of time (solar clocks). All this work is disclosed in a kind of printed pamphlets that were widely read during his time.

In 1464, he completed De triangulis omnimodis ("On triangles of all kinds ") that was one of the first textbooks to present the current state of trigonometry e included lists of questions to review individual chapters. In it he wrote:

You who wish to study great and wonderful things, who wonder about the motion of the stars, should read these theorems about triangles. Knowing these ideas will open the door to all of astronomy now. certain geometric problems.

As a curiosity, Regiomontanus and Bernhard Walther observed the comet of 1472 . Regiomontanus attempted to estimate its distance from Earth, using the parallax angle. According to David A. Seargeant (popular astronomer):

Consistent with the prevailing Aristotelian theory of comets as atmospheric phenomena, he estimated their distance to be at least 8,200 miles (13,120 km), and from this he estimated the central condensation at 26 and the full coma at 81 miles (41.6 and 129.6 km). km respectively) in diameter. These values ​​are, of course, off by orders of magnitude, but he is to be commended for this attempt to determine the physical dimensions of the comet.

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- How beautiful is the night
-if
- full of stars
- look, you can see the Big Dipper
- how beautiful
- and if we do a calculation...
- how?
- ... we measure the distance in a straight line...
- what?
- ...from the star to the ground...
- but...
- ...and then we calculate...
- but you want to leave the math for a moment!
- oops!
- I just want to lie down and enjoy the sky and the tranquility
- sorry, it's the custom
- what a date