< /ˈpɪər pɒnt/, 1834–1906, U.S. astronomer, physicist, and pioneer in aeronautics.
- Samuel Pierpont. 1834–1906, US astronomer and physicist: invented the bolometer (1878) and pioneered the construction of heavier-than-air flying machines
- A unit equal to one gram calorie per square centimeter of irradiated surface, used to measure solar radiation. The langley is named after American astronomer and aeronautical pioneer Samuel Pierpont Langley (1834-1906).