1770 in science

The year 1770 in science and technology involved some significant events.

Astronomy

July 1 – Lexell's Comet passes closer to the Earth than any other comet in recorded history, approaching to a distance of 0.015 AU. It is observed by Charles Messier between June 14 and October 3.

Benjamin Rush publishes Syllabus of a Course of Lectures on Chemistry in Philadelphia, the first chemistry textbook in North America.

March 26 – First voyage of James Cook: English explorer Captain James Cook and his crew aboard complete the circumnavigation of New Zealand.
April 18 – Captain Cook and his crew become the first recorded Europeans to encounter the eastern coastline of the Australian continent.
April 28 – Captain Cook drops anchor in a wide bay about 16 km south of the present city of Sydney, Australia. Because the young botanist on board the ship, Joseph Banks, discovers 30,000 specimens of plant life in the area, 1,600 of them unknown to European science, Cook names the place Botany Bay on May 7.
August 22 – Captain Cook determines that New Holland (Australia) is not contiguous with New Guinea.

French mathematician and political scientist Jean-Charles de Borda formulates the ranked preferential electoral system which becomes known as the Borda count.
Lagrange discusses representations of integers by general algebraic forms; produces a tract on elimination theory; publishes his first paper on the general process for solving an algebraic equation of any degree via Lagrange resolvents ; and proves Bachet's theorem that every positive integer is the sum of four squares.

The fossilised bones of a huge animal are found in a quarry near Maastricht in the Netherlands.