Paul Harzer (1857,

Großenhain Großenhain (; also written as Grossenhain; , ) is a Große Kreisstadt (German for major district town) in the district of Meissen, Saxony, Germany. It was originally known as Hayne. The current name simply means "big Hayne". History Großenhain ...

– 1932) was a German

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

and

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

best known for his papers arguing with

Albert Einstein Albert Einstein (14 March 187918 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence f ...

regarding the

Sagnac effect The Sagnac effect, also called Sagnac interference, named after French physicist Georges Sagnac, is a phenomenon encountered in interferometry that is elicited by rotation. The Sagnac effect manifests itself in a setup called a ring interferomete ...

and its relationship to

Special Relativity In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between Spacetime, space and time. In Albert Einstein's 1905 paper, Annus Mirabilis papers#Special relativity, "On the Ele ...

. Harzer was Professor of Astronomy at the University of Kiel and Director of its observatory. His published article on the experiment of

Franz Harress The Sagnac effect, also called Sagnac interference, named after French physicist Georges Sagnac, is a phenomenon encountered in interferometry that is elicited by rotation. The Sagnac effect manifests itself in a setup called a ring interferomete ...

drew two reply articles from Einstein.

References

1857 births 1932 deaths People from Großenhain People from the Kingdom of Saxony German Lutherans 19th-century German astronomers 19th-century German mathematicians 20th-century German mathematicians 20th-century German astronomers University of Kiel alumni {{germany-mathematician-stub