Equator is derived from medieval Latin word "aequator", in the phrase "circulus aequator diei et noctis," meaning ‘circle equalizing day and night’, from the Latin word "aequare" meaning ‘make equal’. The latitude of the Earth's equator is, by definition, 0° (zero degrees) of arc. The Equator is one of the five notable circles of latitude on Earth; the other four are both polar circles (the Arctic Circle and the Antarctic Circle) and both tropical circles (the Tropic of Cancer and the Tropic of Capricorn). The Equator is the only line of latitude which is also a great circle — that is,
Equal Ever After on the record." In a profile piece in the "London Evening Standard", Katie Law described "Equal Ever After" as a "a minute-by-minute, tub-thumping, 326-page account." Equal Ever After Equal Ever After: The Fight for Same-Sex Marriage - And How I Made it Happen is a 2016 book by British politician Lynne Featherstone, published by Biteback Publishing. Featherstone, the Member of Parliament for Hornsey and Wood Green (2005–15) served as Parliamentary Under-Secretary for Equalities in the Conservative-Liberal Democrat coalition. In this role she worked to ensure the legalisation of Same-sex marriage in the United Kingdom. "Equal Ever After" seeks to present