Airy (lunar crater)

Airy is a lunar impact crater located in the southern highlands. It is named in honour of British astronomer George Biddell Airy. It forms the southern-most member of a chain of craters consisting of Vogel, Argelander, and Airy. A little further to the south lies Donati. Airy has a worn, and somewhat polygonal rim that it broken at the northern and southern ends. It has an irregular floor and a central peak.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Airy.

References

Lunar craters

Lunar craters are craters on Earth's Moon. The Moon's surface has many craters, almost all of which were formed by impacts.

History

The word crater was adopted by Galileo from the Greek word for vessel - (Κρατήρ a Greek vessel used to mix wine and water). Galileo built his first telescope in late 1609, and turned it to the Moon for the first time on November 30, 1609. He discovered that, contrary to general opinion at that time, the Moon was not a perfect sphere, but had both mountains and cup-like depressions, the latter of which he gave the name craters.

Scientific opinion as to the origin of craters swung back and forth over the ensuing centuries. The competing theories were (a) volcanic eruptions blasting holes in the Moon, (b) meteoric impact, (c) a theory known as the Welteislehre developed in Germany between the two World Wars which suggested glacial action creating the craters.

Evidence collected during the Apollo Project and from unmanned spacecraft of the same period proved conclusively that meteoric impact, or impact by asteroids for larger craters, was the origin of almost all lunar craters, and by implication, most craters on other bodies as well.

Airy

Airy may refer to:

Airy (Martian crater)

Airy is an impact crater on Mars, named in honor of the British Astronomer, Royal Sir George Biddell Airy (1801–1892). The crater is approximately 43 kilometres (27 mi) in diameter and is located at 0.1°E 5.1°S in the Meridiani Planum region. The much smaller crater Airy-0, which defines the location of Mars' prime meridian, lies within it.

References

Airy (software)

Airy is software developed by Eltima Software for downloading videos from YouTube.

The first version of the product was released in 2013. Written in Objective C it was a basic downloading tool that could process one video at a time.CNET staff in their review says that "It has a very streamlined interface with just a couple of options and a copy/paste mechanic." Additional functionality was added including the capacity to download a few files simultaneously by copy-pasting links in a text editor. The app can convert downloaded content into a format and resolution of user's choice – HD, SD and low definition. The app is capable of extracting audio files from videos. Starting from version 2.0 the app can download entire YouTube playlists.

Initially developed for Mac OS, Airy also supports Windows. Marina Dan from Softpedia says that "Airy is a useful and reliable piece of software that provides with the means of downloading videos or extracting the audio from selected clips on YouTube" The Mac version has more features than the one for Windows, including playlists download and ability to pause and resume downloads.

Crater

Crater may refer to:

In landforms:

Other:

Crater (Aden)

Crater (/ˈkreɪtər/; Arabic: كريتر‎, [ˈkɾeːtəɾ]), also Kraytar, is a district of the Aden Governorate, Yemen. Its official name is Seera (Arabic: صيرة Ṣīrah). It is situated in a crater of an ancient volcano which forms the Shamsan Mountains. In 1991, the population was 70,319. As of 2003, the district had a population of 76,723 people.

In the closing days of British rule in 1967, Crater District became the focus of the Aden Emergency, sometimes called the last imperial war. After a mutiny of hundreds of soldiers in the South Arabian Federation Army on 20 June, all British forces withdrew from the Crater. The Crater was occupied by Arab fighters while British forces blocked off its two main entrances. In July, a British infantry battalion, led by Lt. Col. Colin Mitchell of the Argyll & Sutherland Highlanders, entered the Crater and managed to occupy the entire district overnight with no casualties. Nevertheless, deadly guerrilla attacks soon resumed, with the British leaving Aden by the end of November 1967, earlier than had been planned by British Prime Minister Harold Wilson and without an agreement on the succeeding governance.