20 kroner DENMARK (2013) Scientists - Tycho Brahe

in the coin centre head of Queen Margrethe II of Denmark facing right; along the top edge: MARGRETHE II DANMARKS DRONNING (Margrethe II Queen of Denmark); along the bottom edge year of issue: 2013

in the coin centre drawing by Tycho Brahe showing the constellation Cassiopeia and the supernova indicated by larger star; below a date: 1572; along the top edge: TYCHO BRAHE • STELLA NOVA (new star); along the bottom edge face value: 20 KRONER

seven plain and seven reeded sections

7 X 2013

still circulating

Lis Nogel

Den Kongelige Mønt (The Royal Mint), Copenhagen (mint mark before DANMARKS on the obverse)

2013

300 000

Commemorative coin with face value of 20 kroner from 2013 commemorates the world's first observation of supernova by Tycho Brahe (1546-1601). In November 1572 Tycho Ottesen Brahe, a young Danish astronomer, observed completely new strong light in the Cassiopeia constellation. He decided that this was a newborn star, what contradicted the Aristotle principle about the invariance of the sky. When publishing his discovery a few months later, he called this object Stella Nova. Today we know that the observed a supernova, which is an explosion of a celestial body. Remnants of a supernova explosion were named Tycho Supernova to honor Brahe, although it is known today that he was not the only discoverer of the supernova.

Drawing by Tycho Brahe from his publication from 1573 showing contemporarily known stars of the Cassiopeia constellation and newly observed supernova.

The Danish series of thematic coins "Scientists" was launched to commemorate the centenary of the publication of the atomic model by Niels Bohr. Danes decided to show that Bohr was not the only Danish, who had part in the history of scientific progress. The thematic series includes:

	20 kroner - Scientists - Niels Bohr (2013)
	20 kroner - Scientists - Hans Christian Ørsted (2013)
	20 kroner - Scientists - Ole Rømer (2013)
	20 kroner - Scientists - Tycho Brahe (2013)