Tuesday named after Mars
Tuesday  is the day of the week between Monday and Wednesday. According to international standard ISO 8601, Monday is the first day of the week; thus, Tuesday is the second day of the week. According to some commonly used calendars, however, especially in the United States, Sunday is the first day of the week, so Tuesday is the third day of the week. In Muslim countries, Saturday is the first day of the week and thus Tuesday is the fourth 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, and law and justice in Norse mythology. Tiw was equated with Mars in the interpretatio germanica, and the name of the day is a translation of Latin dies Martis.Etymology
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 Old Norse. *Tîwaz derives from the Proto-Indo-European base *dei-, *deyā-, *dīdyā-, meaning 'to shine', whence comes also such words as "deity".The German Dienstag and Dutch dinsdag are derived from the Germanic custom of the thing, as Tiw / Týr also had a strong connection to the thing.
The Latin name dies Martis ("day of Mars") is equivalent to the Greek ἡμέρα Ἄρεως (hēméra Áreōs, "day of Ares"). In most languages with Latin origins (Italian, French, Spanish, Catalan, Romanian, Galician, Sardinian, Corsican, but not Portuguese), the day is named after Mars, the Roman parallel of the Ancient Greek Ares (Ἄρης).
In some Slavic languages the word Tuesday originated from Old Church Slavonic word въторъ meaning "the second". Bulgarian and Russian Вторник (Vtornik) (Serbian: уторак utorak) is derived from the Bulgarian and Russian adjective for 'second' - Втори (Vtori) or Второй (Vtoroi).
In Japanese, the second day of the week is 火曜日 (kayōbi), from 火星 (kasei), the planet Mars. Similarly, in Korean the word Tuesday is 화요일 (hwa yo il), also meaning Mars day.
In the Indo-Aryan languages Pali and Sanskrit the name of the day is taken from Angaraka ('one who is red in colour'), a style (manner of address) for Mangala, the god of war, and for Mars, the red planet.
In the Nahuatl language, Tuesday is Huītzilōpōchtōnal (Nahuatl pronunciation: [wiːt͡siloːpoːt͡ʃˈtoːnaɬ]) meaning "day of Huitzilopochtli".
In Arabic, Tuesday is الثلاثاء (al-Thulatha'), and in Hebrew it is יום שלישי (Yom Shlishi), meaning "the third". When added after the word يوم / יום (yom or youm) it means "the third day".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; it is believed that this is due to the association between Tuesday and Mars, the god of war and therefore related to death. 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 Bereshit (parashah), known in the Christian tradition as the first chapters of Genesis, the paragraph about this day contains the phrase "it was good" twice.In the Thai solar calendar, the day is named for the Pali word for the planet Mars, which also means "Ashes of the Dead"; the color associated with Tuesday is pink.
In the folk rhyme Monday's Child, "Tuesday's child is full of grace".Astrology
In astrology, Tuesday is aligned by the planet Mars and the astrological signs of Aries and Scorpio.
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