Poincaré is a French surname. Notable people with the surname include:
- Henri Poincaré (1854–1912), physicist, mathematician and philosopher of science
- Lucien Poincaré (1862–1920), physicist, brother of Raymond and cousin of Henri
- Raymond Poincaré (1860–1934), French Prime Minister or President inter alia from 1913 to 1920, cousin of Henri
Poincaré is a large lunar impact basin that lies in the southern hemisphere on the far side of the Moon. Most of the formation has been heavily eroded by subsequent impacts, leaving a battered formation with only rugged remnants of the original outer rim to the west.
The eastern half has been completely worn away, and much of the interior has been resurfaced by lava flows. This surface has a lower albedo than the surrounding terrain, giving it a dark appearance. A rugged formation forms a low north-south range across the eastern section of the floor, possibly the remnant of an inner ring.
The perimeter of Poincaré has several notable craters. To the north is the crater Hopmann, while the craters Abbe and Hess lie to the east. Directly to the west is Planck, a walled plain of similar dimensions to Poincaré. Both formations are sufficiently large to have formed a small lunar mare on the near side face of the Moon.
- redirect Poincaré (crater)