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Relationship of the atmosphere and ionosphere. The ionosphere (/ aɪ ˈ ɒ n ə ˌ s f ɪər /) [1] [2] is the ionized part of the upper atmosphere of Earth, from about 48 km (30 mi) to 965 km (600 mi) above sea level, [3] a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar ...
Musica universalis—which had existed as a metaphysical concept since the time of the Greeks—was often taught in quadrivium, [8] and this intriguing connection between music and astronomy stimulated the imagination of Johannes Kepler as he devoted much of his time after publishing the Mysterium Cosmographicum (Mystery of the Cosmos), looking over tables and trying to fit the data to what he ...
An 18th-century map of Florida. This is a timeline of the U.S. state of Florida. Pre-European. 15,405–14,146 BC: Page-Ladson site. ... Timeline of Florida history.
Ancient music – Early history – 1500s – 1510s – 1520s – 1530s – 1540s ... Popular music; Timeline of musical events ... Federation of the Phonographic ...
Music history of the United States Colonial era – to the Civil War – During the Civil War – Late 19th century – 1900–1940 – 1950s – 1960s – 1970s – 1980s This is a timeline of music in the United States .
Timeline of progressive rock; Timeline of progressive rock (1960–1969) Timeline of progressive rock (1970–1979) Timeline of progressive rock (1980–1989) Timeline of progressive rock (1990–1999) Timeline of progressive rock (2000–2009) Timeline of progressive rock (2010–2019) Timeline of progressive rock (2020–2029) Timeline of ...
The genealogy of musical genres is the pattern of musical genres that have contributed to the development of new genres. Evolution in musical instruments [1] in technology and in culture can influence the evolution of musical genres.
In November 1938, 405-line video from the BBC Alexandra Palace television station (London, England) on channel B1 (45.0 MHz) was received in New York, US. [1]In 1958, the FM broadcast radio DX record was set by DXer Gordon Simkin in southern California, United States, when he logged a 45 MHz commercial FM station from Korea via trans-Pacific F2 propagation at a distance of 5,000 miles (8,000 km).