Paul Langevin ForMemRS (/lænʒˈveɪn/; French: [pɔl lɑ̃ʒvɛ̃]; 23 January 1872 – 19 December 1946) was a prominent French physicist who developed Langevin dynamics and the Langevin equation. He was one of the founders of the Comité de vigilance des intellectuels antifascistes, an antifascist organization created in the wake of the 6 February 1934 far right riots. Langevin was also president of the Human Rights League (LDH) from 1944 to 1946 – he had just recently joined the French Communist Party.
Parallels occur when two planets are at the same declination, both in the north or south. They are considered to have the same effect as conjunctions. Contraparallels are when one star in the north and another in the south are at the same declination. They are considered to have the same effect as oppositions.