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In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
[19] [20] In 2016, the airline returned to profit for the first time in several years. [21] On 6 October 2017, Korean Air announced the sale of its 44 percent stake in Czech Airlines, which it had held for four years, to Travel Service. Travel Service by then owned 78.9 percent of ČSA. [22] Czech state company Prisko owned 20 percent of ČSA. [22]
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...
Czech orthography is a system of rules for proper formal writing ( orthography) in Czech. The earliest form of separate Latin script specifically designed to suit Czech was devised by Czech theologian and church reformist Jan Hus, the namesake of the Hussite movement, in one of his seminal works, De orthographia bohemica ( On Bohemian ...
Following the break-up of Czechoslovakia in 1993, the successor states, the Czech Republic and Slovakia, continued to share the 42 country code until 28 February 1997, with the Czech Republic then adopting 420 and Slovakia adopting 421.
An example of the Landolt C eye chart (also known as the Japanese eye chart.). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
The Czechoslovak koruna (in Czech and Slovak: koruna československá, at times koruna česko-slovenská; koruna means crown) was the currency of Czechoslovakia from 10 April 1919 to 14 March 1939, and from 1 November 1945 to 7 February 1993. For a brief time in 1939 and again in 1993, it was also the currency of both the separate Czech ...