See also: 1804 in science, other events of 1805, 1806 in science and the list of years in science.

Table of contents

1 Exploration 2 Awards 3 Births 4 Deaths

Exploration

• April 7 - The Lewis and Clark expedition leaves Fort Mandan, bound for the Pacific Ocean
• August 9 - Zebulon Pike leaves St. Louis to explore the headwaters of the Mississippi River
• November 16 - The Lewis and Clark expedition reaches the Pacific Ocean at the mouth of the Columbia River

• Copley Medal: Humphry Davy

• February 13 - Peter Gustav Lejeune Dirichlet, mathematician (died 1859)
• May 12 - William Rowan Hamilton, mathematician, physicist, and astronomer (died 1865)
• December 16 - Isidore Geoffroy Saint-Hilaire, zoologist (died 1861)
• December 20 - Thomas Graham, chemist (died 1869)