RI or Ri may refer to:
In both astrology and historical astronomy, the zodiac (Greek: ζῳδιακός, zōidiakos) is a circle of twelve 30° divisions of celestial longitude that are centered upon the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The paths of the Moon and visible planets also remain close to the ecliptic, within the belt of the zodiac, which extends 8-9° north or south of the ecliptic, as measured in celestial latitude. Because the divisions are regular, they do not correspond exactly to the boundaries of the twelve constellations after which they are named.
Historically, these twelve divisions are called signs. Essentially, the zodiac is a celestial coordinate system, or more specifically an ecliptic coordinate system, which takes the ecliptic as the origin of latitude, and the position of the Sun at vernal equinox as the origin of longitude.
The zodiac was in use by the Roman era, based on concepts inherited by Hellenistic astronomy from Babylonian astronomy of the Chaldean period (mid-1st millennium BC), which, in turn, derived from an earlier system of lists of stars along the ecliptic. The construction of the zodiac is described in Ptolemy's vast 2nd century AD work, the Almagest.
R&I may refer to:
R.I.O. is a German DJ-duo (formerly trio). The current members are DJ Manian and Yann Peifer. Until 2012, Neal Dyer was part of the group. Their biggest hit was the song "Turn This Club Around" landing in the top 5 of charts in Germany and Austria and at number one in Switzerland.
The two German DJs Manian and Yanou founded the act R.I.O. in the summer of 2007, after their great success with joint projects such as Cascada and Tune Up!. R.I.O. was initially intended as an "experimental project". The name is derived from their first recording with the same title, as well as the re-release as "De Janeiro". In their songs Manian and Yanou are active as songwriter, composer and producer. Next to them, in all the titles Andres Ballinas, a good friend of the duo, cooperates as an author.
Also, it's a known fact that R.I.O. plays the Jesus Christ (from Nazareth) part in the music video "Shine On".
In addition to their own releases they often appear as remixers in appearance. Songs by artists who are a member of their own label Zooland Records, for example the ItaloBrothers or King & White, as well as old and new single releases of the members Manian and Yanou be mixed by them irregularly in the ordinary R.I.O.-style.