1671 in science

The year 1671 in science and technology involved some significant events.

Astronomy[]

• Completion of Paris Observatory, the world's first such national institution.^[1]

Mathematics[]

• James Gregory develops a series expansion for the inverse tangent function and discovers Taylor's theorem.
• Sawaguchi Kazuyuki (沢口 一之) publishes Kokin-Sanpo-Ki　(古今算法之記), in which he gives the first comprehensive applied account of Chinese algebra in Japan.

Medicine[]

• Publication of Les secrets de la medecine des Chinois, the first Western book on traditional Eastern medicine, in Grenoble.

Physics[]

• Jacques Rohault publishes Traité de physique in Paris, disseminating Cartesian physics.

Births[]

• October 1 – Guido Grandi, Italian mathematician (died 1742)

Deaths[]

• June 25 – Giovanni Battista Riccioli, Italian astronomer (born 1598)

References[]