Willem Henri Julius

Willem Henri Julius (4 August 1860 – 15 April 1925) was a Dutch physicist who specialised in the study of solar radiation and related phenomena.

Julius was born in Zutphen, and is the son of a namesake school teacher and his wife Maria Margaretha Dumont.

He became an assistant to C. H. D. Buys Ballot in 1882; in 1888, Julius worked with an uncle who was also a physicist.

In 1888, he wrote a doctoral dissertation on the spectra from flames and the vibrational frequencies of some gases under Buys Ballot.

He examined anomalous scattering and its relation to differences in redshift in the spectra of rays at the prominences and at the centre of the solar disk.