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🔗 Telecommunications 🔗 Meteorology 🔗 Astronomy 🔗 Solar System

The solar storm of 1859 (also known as the Carrington Event) was a powerful geomagnetic storm during solar cycle 10 (1855–1867). A solar coronal mass ejection (CME) hit Earth's magnetosphere and induced the largest geomagnetic storm on record, September 1–2, 1859. The associated "white light flare" in the solar photosphere was observed and recorded by British astronomers Richard C. Carrington (1826–1875) and Richard Hodgson (1804–1872). The storm caused strong auroral displays and wrought havoc with telegraph systems. The now-standard unique IAU identifier for this flare is SOL1859-09-01.

A solar storm of this magnitude occurring today would cause widespread electrical disruptions, blackouts and damage due to extended outages of the electrical grid. The solar storm of 2012 was of similar magnitude, but it passed Earth's orbit without striking the planet, missing by nine days.

🔗 Middle Ages 🔗 Middle Ages/History 🔗 Celts 🔗 Writing systems 🔗 Ireland 🔗 Medieval Scotland

Ogham (Modern Irish: [ˈoː(ə)mˠ]; Middle Irish: ogum, ogom, later ogam [ˈɔɣəmˠ]) is an Early Medieval alphabet used primarily to write the early Irish language (in the "orthodox" inscriptions, 4th to 6th centuries AD), and later the Old Irish language (scholastic ogham, 6th to 9th centuries). There are roughly 400 surviving orthodox inscriptions on stone monuments throughout Ireland and western Britain, the bulk of which are in southern Munster. The largest number outside Ireland are in Pembrokeshire, Wales.

The vast majority of the inscriptions consist of personal names.

According to the High Medieval Bríatharogam, the names of various trees can be ascribed to individual letters. For this reason, ogam is sometimes known as the Celtic tree alphabet.

The etymology of the word ogam or ogham remains unclear. One possible origin is from the Irish og-úaim 'point-seam', referring to the seam made by the point of a sharp weapon.

🔗 Aviation 🔗 Aviation/aircraft 🔗 United Kingdom 🔗 British Empire 🔗 Aviation/Defunct Airlines

The British Imperial Airship Scheme was a 1920s project to improve communication between Britain and the distant countries of the British Empire by establishing air routes using airships. This led to the construction of two large and technically advanced airships, the R100 and the R101. The scheme was terminated in 1931 following the crash of R101 in October 1930 while attempting its first flight to India.

The Object Oriented Role Analysis and Modeling (OOram) is a method, based on the concept of role, for performing object-oriented modeling.

Originally (1989) coined Object Oriented Role Analysis, Synthesis and Structuring (OORASS), the method focuses on describing patterns of interaction without connecting the interaction to particular objects/instances. OOram was originally developed by Trygve Reenskaug (1996), a professor at the University of Oslo and the founder of the Norwegian IT company Taskon. The use of "roles" in OOram is similar in application to that of Agent-oriented programming.

Enterprise models created according to OOram may have a number of views, with each view presenting certain aspects of a model. The following ten views are proposed:

1. Area of concern view: Textual description of a phenomenon represented in the role model.
2. Stimulus-response view: Describes how environment roles may trigger activities in the organization (stimulus), together with the effect (response).
3. Role list view: List describing all roles of a role model together with attributes and textual explanation.
4. Semantic view: Describes meaning of roles and relationships between roles.
5. Collaboration view: Describes patterns of roles and message paths.
6. Interface view: Describes all messages that can be sent along a message path.
7. Scenario view: Provides a sample sequence of messages flowing between roles (a concrete example).
8. Process view: Describes data flow between roles and associated activities performed by the roles.
9. State diagram view: For each role, the legal states can be described together with messages that trigger transitions.
10. Method specification view: Describes what messages to send for each method belonging to a role. May also specify procedures to perform.

OOram suggests a varied mix of formal and informal notations and languages for representing and communicating models. Which view to use depends upon the needs in a particular situation.

🔗 Geography 🔗 Maps

The Peirce quincuncial projection is a conformal map projection developed by Charles Sanders Peirce in 1879. The projection has the distinctive property that it can be tiled ad infinitum on the plane, with edge-crossings being completely smooth except for four singular points per tile. The projection has seen use in digital photography for portraying 360° views. The description quincuncial refers to the arrangement of four quadrants of the globe around the center hemisphere in an overall square pattern. Typically the projection is oriented such that the north pole lies at the center.

🔗 Physics

A Klemperer rosette is a gravitational system of heavier and lighter bodies orbiting in a regular repeating pattern around a common barycenter. It was first described by W. B. Klemperer in 1962, and is a special case of a central configuration.

Klemperer described the system as follows:

Such symmetry is also possessed by a peculiar family of geometrical configurations which may be described as 'rosettes'. In these an even number of 'planets' of two (or more) kinds, one (or some) heavier than the other, but all of each set of equal mass, are placed at the corners of two (or more) interdigitating regular polygons so that the lighter and heavier ones alternate (or follow each other in a cyclic manner).

The simplest rosette would be a series of four alternating heavier and lighter bodies, 90 degrees from one another, in a rhombic configuration [Heavy, Light, Heavy, Light], where the two larger bodies have the same mass, and likewise the two smaller bodies have the same mass. The number of "mass types" can be increased, so long as the arrangement pattern is cyclic: e.g. [ 1,2,3 ... 1,2,3 ], [ 1,2,3,4,5 ... 1,2,3,4,5 ], [ 1,2,3,3,2,1 ... 1,2,3,3,2,1 ], etc.

Klemperer also mentioned octagonal and rhombic rosettes. While all Klemperer rosettes are vulnerable to destabilization, the hexagonal rosette has extra stability because the "planets" sit in each other's L4 and L5 Lagrangian points.

🔗 Video games 🔗 Video games/Nintendo

The Satellaview is a satellite modem peripheral produced by Nintendo for the Super Famicom in 1995. Containing 1 megabit of ROM space and an additional 512K of RAM, Satellaview allowed players to download games, magazines and other forms of content through satellite broadcasts provided by Japanese company St.GIGA. To use Satellaview, players had to purchase a special broadcast satellite (BS) tuner directly from St.GIGA or rent one for a six-month fee, and to pay monthly maintenance fees to both St.GIGA and Nintendo. It was attached to the bottom of the Super Famicom via the system's expansion port. It featured heavy support from third-party developers, including Squaresoft, Taito, Konami, Capcom and Seta.

Satellaview was the result of a collaboration between Nintendo and St.GIGA, the latter being known in Japan for its "Tide of Sound" nature sound music. By 1994, St.GIGA was struggling financially due to the Japanese Recession affecting the demand for its music; Nintendo initiated a "rescue" plan by purchasing a stake in the company. Satellaview was produced by Nintendo Research & Development 2, the same team that designed the Super Famicom itself, and was made to cater towards a more adult-oriented market. By 1998, Nintendo's relationship with St.GIGA was beginning to collapse due to the company refusing to go forward with a debt-management plan and failing to secure a government broadcasting license. Nintendo withdrew support for Satellaview in March 1999, with St.GIGA continuing to supply content until June 30, 2000, when it was ultimately discontinued.

The rise of technologically-superior consoles such as the Sega Saturn and PlayStation and its high cost made consumers reluctant to purchase Satellaview, especially due to it only being sold via mail order, or through specific electronic store chains. Despite this, St.GIGA reported seeing over 100,000 subscribers by March 1997. Retrospectively, Satellaview has been praised by critics for its technological accomplishments and the overall quality of its games, particularly those from the Legend of Zelda series. In recent years, it has gained a strong cult following due to much of its content being deemed lost, with video game preservation groups being formed to dump and preserve its games and other services online.

🔗 Military history 🔗 Military history/North American military history 🔗 Military history/United States military history

Millennium Challenge 2002 (MC02) was a major war game exercise conducted by the United States Armed Forces in mid-2002. The exercise, which ran from 24 July to 15 August and cost US$250 million (equivalent to about $355M in 2019), involved both live exercises and computer simulations. MC02 was meant to be a test of future military "transformation"—a transition toward new technologies that enable network-centric warfare and provide more effective command and control of current and future weaponry and tactics. The simulated combatants were the United States, referred to as "Blue", and a fictitious state in the Persian Gulf, "Red", often characterized as Iran or Iraq.