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• Measured in degrees, minutes, seconds
• 1 degree = 60 minutes (1° = 60’)• 1 minute = 60 seconds (1’ = 60’’)
Nautical mile (nm)• 1 nm = 1’ of arc length of latitude• 1 nm = 1’ of arc length of longitude at the equator
Latitude and longitude
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Latitudes (or parallels) are parallel to the equator• 0 to +90° Northern Hemisphere• 0 to -90° Southern Hemisphere• Small circles
Longitudes (or meridians) are formed at right angles to the latitude lines
• Measured from the Prime Meridian• 0 to 360° East from the Prime meridian• Or, 0 to +180°E and 0 to -180°W• International date line• Great circles
Latitude and longitude
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Longitude and time • Use of clocks to record the time the Sun is at its
zenith• Greenwich Mean Time (GMT) or Universal Time• Earth rotates 15° of longitude each hour
http://www.rmg.co.uk/harrison
http://www.bbc.co.uk/news/world-13334229 (Samoa changes time zone)
East Increase – West Less(1 hr per l5°)
If it 9 p.m. at Position D, what time is it at position C? Position B?
If it is 1 p.m. at Position X, at which location is the time 5 p.m.
• Look at the East Coast of the United States. The lights are already lit.
• California the sun is still visible.
Earth rotates west to east Solar time is based on the position of the sunNIGHT IS FALLING ON EARTH