Leo, in astronomy
Leo [Lat.,=the lion], northern constellation constellation, in common usage, group of stars that appear to form a configuration in the sky; properly speaking, a constellation is a definite region of the sky in which the configuration of stars is contained...... Click the link for more information. lying S of Ursa Major and on the ecliptic ecliptic (ēklĭp`tĭk, ĭ–)
..... Click the link for more information. (apparent path of the sun through the heavens) between Cancer and Virgo; it is one of the constellations of the zodiac zodiac (zō`dēăk) [Gr.
..... Click the link for more information. . The Egyptians, Babylonians, Arabs, and Greeks all represented this constellation as a lion; it may be the first constellation to be pictorially represented. The most famous star in Leo is Regulus Regulus (rĕg`yələs), brightest star in the constellation Leo ; Bayer designation Alpha Leonis; 1992 position R.A.
..... Click the link for more information. (Alpha Leonis). The western part of the constellation is a curved line known as the Sickle; it represents the lion's head. The main constellation terminates in Denebola (Beta Leonis), the Lion's Tail. The meteor showers meteor shower, increase in the number of meteors observed in a particular part of the sky. The trails of the meteors of a meteor shower all appear to be traceable back to a single point in the sky, known as the radiant point, or radiant.
..... Click the link for more information. known as the Leonids appear to come from this constellation. Leo reaches its highest point in the evening sky in April.
Leo
(Latin: “Lion”) In astronomy, the constellation lying between Cancer and Virgo; in astrology, the fifth sign of the zodiac, governing approximately the period July 23–August 22. Its symbol, a lion, has been associated with the Nemean lion slain by Heracles. The Nemean lion was considered invulnerable because its skin was impervious to arrows, but Heracles battered it to death with a club. Zeus put the lion in the sky as a constellation.
LEO
(Low-Earth Orbit) A communications satellite in orbit 400 to 1600 miles above the earth. Being much closer than 22,282 mile-high geosynchronous satellites (GEOs), LEO signals make the round trip from earth much faster. Thus, low-powered "pizza dishes" and handheld devices can be used. LEOs are also better suited to interactive conferencing. Unlike GEOs, which travel at earth speed, LEOs revolve around the globe every couple of hours, and any single LEO is in view for only a few minutes. In order to maintain continuous communications, multiple LEOs must be used. From 48 to 66 LEOs are needed to cover the earth. See Iridium, Teledesic, GEO and MEO.
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| It Takes a Lot of LEOs |
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| While the footprint of a GEO can cover the bulk of a continent, it takes many LEOs to cover the same area. Signals also travel to and from LEOs faster, making them more suitable for real-time applications than GEOs. |
Leo1
Leo2
leo [′lē·ō]
Leo [′lē·ō]
LEO [′lē·ōor¦el¦ē′ō]
| 1. | LEO - Low Earth Orbit | ||
| 2. | Leo - 1. ["The Leo Programming Language", G. Townsend, CS TR 84-7, U Arizona 1984]. |
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