Career
In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium
He was the director of the Observatorio Astronómico de Louisiana Plata from November 1922 to May 1934. He oriented the work of the observatory towards astrophysics. He discovered three asteroids.
His doctorate was from the University of Leipzig in 1891 on lunar eclipses.