Tuesday (i//, //, /ˈtuːzdeɪ/ or /ˈtuːzdi/) is a day of the week occurring after Monday and before Wednesday. According to some commonly used calendars (esp. in the US), it is the third day of the week, but according to international standard ISO 8601, it is the second day of the week. The English name is derived from Old English Tiwesdæg and Middle English Tewesday, meaning "Tīw's Day", the day of Tiw or Týr, the god of single combat, victory and heroic glory in Norse mythology. Tiw was equated with Mars in the interpretatio romana, and the name of the day is a translation of Latin dies Martis.
The name Tuesday derives from the Old English "Tiwesdæg" and literally means "Tiw's Day". Tiw is the Old English form of the Proto-Germanic god *Tîwaz, or Týr in Norse, a god of war and law. *Tîwaz derives from the Proto-Indo-European base *dei-, *deyā-, *dīdyā-, meaning 'to shine', whence comes also such words as "deity".
The Latin name dies Martis ("day of Mars") is equivalent to the Greek ἡμέρα Ἄρεως. In most languages with Latin origins (French, Spanish, Catalan, Italian, Romanian, Galician, Sardinian, Corsican, but not Portuguese), the day is named after Mars, the Roman god of war.
In some Slavic languages the word Tuesday originated from Old Church Slavonic word въторъ meaning "the second" (Serbian: уторак (utorak)). Bulgarian and Russian "Вторник" (Vtornik) is derived from the Bulgarian and Russian adjective for 'Second' - "Втори" (Vtori) or "Второй" (Vtoroi)
In Japanese, the word Tuesday is 火曜日(ka youbi), meaning 'fire day' and is associated with 火星 (kasei): Mars (the planet), literally meaning "fire star". Similarly, in Korean the word Tuesday is 화요일 (hwa yo il), also meaning fire day.
In the Indo-Aryan languages Pali and Sanskrit, as well as in Thailand, the name of the day is taken from Angaraka ('one who is red in colour') a style (manner of address) for Mangal, the god of war, and for Mars, the red planet.
Religious observances 
In the Eastern Orthodox Church, Tuesdays are dedicated to Saint John the Baptist. The Octoechos contains hymns on this theme, arranged in an eight-week cycle, that are chanted on Tuesdays throughout the year. At the end of Divine Services on Tuesday, the dismissal begins with the words: "May Christ our True God, through the intercessions of his most-pure Mother, of the honorable and glorious Prophet, Forerunner and Baptist John…"
Cultural references 
In the Greek world, Tuesday (the day of the week of the Fall of Constantinople) is considered an unlucky day. The same is true in the Spanish-speaking world. For both Greeks and Spanish-speakers, the 13th of the month is considered unlucky if it falls on Tuesday, instead of Friday. In Judaism, on the other hand, Tuesday is considered a particularly lucky day, because in the first chapter of Genesis the paragraph about this day contains the phrase "it was good" twice.
In the folk rhyme Monday's Child, "Tuesday's child is full of grace".
Tuesday is associated with the planet Mars and shares that planet's symbol, ♂.
Common occurrences 
United States 
Tuesday is the usual day for elections in the United States. Federal elections take place on the Tuesday after the first Monday in November; this date was established by a law of 1845 for presidential elections (specifically for the selection of the Electoral College), and was extended to elections for the House of Representatives in 1875 and for the Senate in 1914. Tuesday was the earliest day of the week which was practical for polling in the early 19th century: citizens might have to travel for a whole day to cast their vote, and would not wish to leave on Sunday which was a day of worship for the great majority of them. However, political scientists today suggest that moving elections to a day such as Sunday might increase voter turnout, as the employed would have an easier time voting.
Named days 
- Black Tuesday, in the United States, refers to Tuesday, October 29, 1929, part of the great Stock Market Crash of 1929. This was the Tuesday after Black Thursday. The crash is said to have marked the start of the Great Depression.
- Patch Tuesday is the second Tuesday of every month when Microsoft releases patches for their products. Some system administrators call this day Black Tuesday.
- Shrove Tuesday (also called Mardi Gras - fat Tuesday) precedes the first day of Lent in the Western Christian calendar.
- Super Tuesday is the day many American states hold their presidential primary elections.
See also 
- "Tuesday". Online Etymology Dictionary. Retrieved 31 August 2010.
- "TIWAZ - The Warrior's Rune". Oswald the Runemaker. Retrieved 31 August 2010.
- Stuart Alan. "Tiw (Tyr)". Anglo-Saxon Heathenism. Retrieved 12 July 2011.
- Klein, E., "deity" and "Tuesday", Comprehensive Etymological Dictionary of the English Language (Elsevier Publishing, 1966), pp. 417—8 & 1662.
- Turner, Sir Ralph Lilley (1962). "aṅgāraka 126". A comparative dictionary of the Indo-Aryan languages. London: Oxford University Press. Digital Dictionaries of South Asia, University of Chicago. p. 7. Retrieved 21 February 2010. "126 aṅgāraka 1. Pali 'red like charcoal'; Sanskrit aṅārī. 2. Pali aṅgāraka masculine 'Mars'; Sanskrit aṅāro masculine 'Tuesday'."
- "อังคาร angM khaanM". Thai-language.com. Retrieved 31 August 2010.
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- Grimm, Jacob. 1875–78. Deutsche Mythologie. Fourth ed., curated by Elard Hugo Meyer, 3 vols. Berlin: F. Dümmler. Reprinted Darmstadt: Wissenschaftliche Buchgesellschaft, 1965.