<P> The feriae of December 23 were devoted to a major ceremony in honour of Acca Larentia (or Larentina), in which some of the highest religious authorities participated (probably including the Flamen Quirinalis and the pontiffs). The Fasti Praenestini marks the day as feriae Iovis, as does Macrobius . It is unclear whether the rite of parentatio was itself the reason for the festival of Jupiter, or if this was another festival which happened to fall on the same day . Wissowa denies their association, since Jupiter and his flamen would not be involved with the underworld or the deities of death (or be present at a funeral rite held at a gravesite). </P> <P> The Latin name Iuppiter originated as a vocative compound of the Old Latin vocative * Iou and pater ("father") and came to replace the Old Latin nominative case * Ious . Jove is a less common English formation based on Iov -, the stem of oblique cases of the Latin name . Linguistic studies identify the form * Iou - pater as deriving from the Indo - European vocative compound * Dyēu - pəter (meaning "O Father Sky - god"; nominative: * Dyēus - pətēr). </P> <P> Older forms of the deity's name in Rome were Dieus - pater ("day / sky - father"), then Diéspiter . The 19th - century philologist Georg Wissowa asserted these names are conceptually - and linguistically - connected to Diovis and Diovis Pater; he compares the analogous formations Vedius - Veiove and fulgur Dium, as opposed to fulgur Summanum (nocturnal lightning bolt) and flamen Dialis (based on Dius, dies). The Ancient later viewed them as entities separate from Jupiter . The terms are similar in etymology and semantics (dies, "daylight" and Dius, "daytime sky"), but differ linguistically . Wissowa considers the epithet Dianus noteworthy . Dieus is the etymological equivalent of ancient Greece's Zeus and of the Teutonics' Ziu (genitive Ziewes). The Indo - European deity is the god from which the names and partially the theology of Jupiter, Zeus and the Indo - Aryan Vedic Dyaus Pita derive or have developed . </P> <P> The Roman practice of swearing by Jove to witness an oath in law courts is the origin of the expression "by Jove!"--archaic, but still in use . The name of the god was also adopted as the name of the planet Jupiter; the adjective "jovial" originally described those born under the planet of Jupiter (reputed to be jolly, optimistic, and buoyant in temperament). </P>

What is the origin of the name jupiter
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