Sextant

A sextant is a doubly reflecting navigation instrument used to measure the angle between any two visible objects. The principle of the instrument was first implemented around 1730 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749) but it was also found later in the unpublished writings of Isaac Newton (1643–1727). The history of these and related instruments, and their forerunners, may be found in the article on reflecting instruments.

The primary use of a sextant is to determine the angle between an astronomical object and the horizon for the purposes of celestial navigation. The determination of this angle, the altitude, is known as sighting (or shooting) the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon or Polaris at night (in the Northern Hemisphere) to determine latitude. Sighting the height of a landmark can give a measure of distance off and, held horizontally, a sextant can measure angles between objects for a position on a chart. A sextant can also be used to measure the lunar distance between the moon and another celestial object (such as a star or planet) in order to determine Greenwich Mean Time and hence longitude.

Sextant (disambiguation)

Sextant may refer to:

See also

Classic (Rah Digga album)

Classic is the second album by American hip hop recording artist Rah Digga. It is her first released since her 2000 debut album Dirty Harriet.

A buzz single entitled "Warning Shots" was released for promotion while "This Ain't No Lil' Kid Rap" was released as the sole single. The album was released through Raw Koncept on September 14, 2010.

Track listing

All songs are produced by Nottz

External links

Rah Digga Talks Comeback LP, Working With Nottz at XXL (magazine)

References

Classic Environment

Classic Environment, usually referred to as Classic, is a hardware and software abstraction layer in PowerPC versions of Mac OS X that allows most legacy applications compatible with Mac OS 9 to run on the Mac OS X operating system. The name "Classic" is also sometimes used by software vendors to refer to the application programming interface available to "classic" applications, to differentiate between programming for Mac OS X and the previous version of the Mac OS.

Classic is supported on PowerPC-based Macintosh computers running versions of Mac OS X up to 10.4 "Tiger", but is not supported with 10.5 "Leopard", nor on Intel-based Macintosh computers running any version of Mac OS X.

Overview

Classic is a descendant of Rhapsody's "Blue Box" emulation layer, which served as a proof of concept. (Previously, Apple A/UX also offered a virtualized MacOS environment on top of a UNIX operating system.) It uses a Mac OS 9 System Folder, and a New World ROM file to bridge the differences between the older PowerPC Macintosh platforms and the XNU kernel environment. Classic was created as a key element of Apple's strategy to replace the "classic" Mac OS (versions 9 and below) with Mac OS X as the standard operating system (OS) used by Macintosh computers by eliminating the need to use the older OS directly.

Classic (Joe McElderry album)

Classic is the second studio album by British singer Joe McElderry. It was released by Decca Records on 19 August 2011 in Ireland and on 22 August 2011 in the United Kingdom. Signed copies were available to pre-order on Universal Music's online store.

Background and production

After his contract with Syco expired, and winning a second TV show, Popstar to Operastar, McElderry confirmed that he would be recording his second studio album, stating, "It’s not going to be pop, it’s going to be a lot of big, lush ballads. I wanted to do a few more ballads on my first album. It’s going to appeal to all my fans. I’m going to sing a few Italian songs. I’m not going to change my voice – I don’t want to scare people too much... I can’t reveal which label it’s with but it’s an amazing label. The label was later revealed to be Decca Records. In a blog, McElderry described the album by talking about the title saying "The album is called Classic, it's classic songs, it's a classic repertoire, it's songs that everybody will know. We're kind of bringing it in and matching it to my style of my voice, but also touching a bit on the classical side as well, so it's all round a classic album". Describing the process of recording the album with a new label, saying "We're doing it quite quickly this time round, it's good to just go with the flow and just get it done and let all the creative emotions flow out very fast. It's really nice to get the experience of working with a different label that has a different kind of view on things. I've just enjoyed kind of getting in there, throwing myself into the deep end and just totally going for it."