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shared by sulaiman on 23 Nov 07 - Cached

Longitude is the east-west geographic coordinate measurement most commonly used in cartography and global navigation.
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A line of longitude is a meridian and half of a great circle.
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Unlike latitude, which has the equator as a natural starting position, there is no natural starting position for longitude.
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shared by sulaiman on 23 Nov 07 - Cached

Altitude is the elevation of a point or object from a known level or datum (plural: data).
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True altitude is the elevation above mean sea level.
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Absolute altitude is the height of the aircraft above the terrain over which it is flying.
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Indicated altitude is the reading on the altimeter.
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Pressure altitude is the elevation above a standard datum plane
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Density altitude is the altitude corrected for non-ISA International Standard Atmosphere (ISA) conditions at which the air density is unequal to ISA conditions.
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The Earth's atmosphere is divided into several altitude regions:[4] Troposphere — surface to 5 miles (8 km) at poles – 11 miles (18 km) at equator), ending at the Tropopause. Stratosphere — Tropopause to 31 miles (50 km) Mesosphere — Stratopause to 53 miles (85 km) Thermosphere — Mesopause to 420 miles (675 km) Exosphere — Thermopause to 6200 miles (10,000 km)
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shared by sulaiman on 23 Nov 07 - Cached

Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator.
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Lines of Latitude are the horizontal lines shown running east-to-west on maps.
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Besides the equator, four other lines of latitude are named because of the role they play in the geometrical relationship with the Earth and the Sun: Arctic Circle — 66° 33′ 39″ N Tropic of Cancer — 23° 26′ 21″ N Tropic of Capricorn — 23° 26′ 21″ S Antarctic Circle — 66° 33′ 39″ S
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