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The year 1920 in science and technology consisted of many events, some of which are included below.

1 Biology

• Andrew Douglass proposes dendrochronology dating.

2 Meteorology

• Milutin Milankovic proposes that long term climatic cycles may be due to changes in the eccentricity of the Earth's orbit and changes in the Earth's obliquity.

3 Physics

• Meghnad Saha states his ionization equation
• Albert Einstein delivers his Leiden Lecture
• Ernest Rutherford predicts the existence of the neutron.
• Arthur Eddington's observation of a total eclipse of the Sun seems to confirm the "bending of light" in Einstien's theory of Special Relativity.
• James Jeans discovers that the dynamical constants of motion determine the distribution function for a system of particles.

4 Technology

• The first transatlantic two-way radio broadcast is made.
• First domestic radio sets come to stores in USA – Westinghouse radio costs $10

5 Nobel Prizes

• Charles Edouard GuillaumeCharles Edouard Guillaume ( February 15 1861 May 13 1938) received the Nobel Prize in Physics in 1920 in recognition of the service he had rendered to precision measurements in Physics by his discovery of anomalies in nickel steel alloys. He discovered al is awarded the Nobel Prize for Physics
• Schack August Steenberg Krogh is awarded the Nobel Prize for Medicine
• Walther Hermann Nernst is awarded the Nobel Prize for Chemistry

6 Births

• January 2January 2 is the 2nd day of the year in the Gregorian Calendar. There are 363 days remaining (364 in leap years). Events 366 Alamanni cross frozen Rhine in large numbers, invading Roman Empire. 1492 Reconquista: Granada, the last Moorish stronghold in Spa - Isaac Asimov (d. 1992), author.
• February 7 - An Wang (d. 1990), computer designer.

7 Deaths

• June 14 - Max Weber (b. 1864), sociologist.