Stjepan Mohorovičić (August 20, 1890 – February 13, 1980) was a Croatian physicist, geophysicist and meteorologist.

[2] Because of his longtime opposition and criticisms of theory of relativity he remained a high school professor his whole life.

In 1913 he developed a new method for locating the hypocenter of an earthquake and gave an independent verification of discontinuity theory put forward by his father.

[7] The existence of Moho layer on the Moon was confirmed in 1969 by seismic measurements done by Apollo 11 crew.

Positronium lines were first identified in lab in 1975 by Canter et al. and in outer space in spectra of Crab Nebula in 1984 by J. E.