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January 6: Second anniversary of marriage to
Early March: Begins to submit one-paragraph
reviews of recent scientific papers on heat theory to the Beiblätter
zu den Annalen der Physik — mainly summaries, with
occasional critical remarks. By the end of the year 21 of these
reviews were published.
March 14: His 26th birthday.
March 17: Sends Annalen der Physik
his photoelectricity paper, “On a Heuristic
Point of View concerning the Production and Transformation of
Light.” Received March 18, published June 9.
May 14: First birthday of son, Hans Albert.
April 30: Submits his University of Zurich doctoral
dissertation, “A New Determination of Molecular Dimensions.”
(Published in 1906.)
May: Sends Annalen der Physik his Brownian
Motion paper, “On the Movement of Small Particles
Suspended in Stationary Liquids Required by the Molecular-Kinetic
Theory of Heat.” Received May 11, published July 18.
Mid-May: Conceives special relativity theory
(he later recalled that he sent the paper in for publication five
or six weeks after the idea came to him).
June: Sends Annalen der Physik his
special relativity theory paper, “On the
Electrodynamics of Moving Bodies.” Received June 30, published
July 27: Doctorate is approved unanimously by
University of Zurich Philosophy II faculty (the degree was formally
awarded January 15, 1906).
August: Sends Annalen der Physik his
doctoral dissertation on size of molecules, received
August 19, published with slight revisions February 8, 1906. This
would become one of Einstein’s most frequently cited papers.
It shows how to use fluid phenomena to determine Avogadro’s
Number, which is related to the size of atoms (and for skeptics,
Late summer: Travels to Serbia with Mileva and
their son, visiting friends and Mileva’s family.
September: Sends Annalen der Physik
his mass-energy equivalence paper, “Does
the Inertia of a Body Depend upon Its Energy Content?” Received
September 27, published November 21. This paper contains the concept
which would later be written E=mc².
October-November: Earns a little money by tutoring
a student on electricity.
December: Sends Annalen der Physik
another paper “On the Theory of Brownian Motion,”
received December 19, published February 8, 1906. This paper improves
and extends his mathematical development of the theory.
This chronology draws chiefly on The Collected
Papers of Albert Einstein, vol. 2, The Swiss Years: Writings,
1900-1909, ed. John Stachel, and vol. 5, The Swiss Years:
Correspondence, 1902-1914, ed. Martin J. Klein, A.J. Kox,
and Robert Schulmann (Princeton, NJ: Princeton University Press,