Atlantis Online
March 28, 2024, 03:54:20 am
Welcome, Guest. Please login or register.

Login with username, password and session length
News: ARE Search For Atlantis 2007 Results
http://mysterious-america.net/bermudatriangle0.html
 
  Home Help Arcade Gallery Links Staff List Calendar Login Register  

PORTOLANS

Pages: [1]   Go Down
  Print  
Author Topic: PORTOLANS  (Read 3752 times)
0 Members and 4 Guests are viewing this topic.
Bianca
Superhero Member
******
Posts: 41646



« on: September 30, 2007, 07:54:57 am »








Useful Information

Parallels: Circles parallel to the equator, ranging from 0° to 90° N or S. Only the equator is a great circle.

Meridians: half-Circles conversing at the poles, ranging from 0° to 180° E or W. Each pair of meridians forms a great circle.

Prime Meridian: 0° or the Greenwich meridian which divides the Western and Eastern hemispheres.

Great Circle: The intersection of a sphere and a plane through its center.

Small Circle: The intersection of a sphere that does not pass though its center.

Time Zones: By convention 24 zones, each 15° longitude wide. Hence, noon at greenwich gives midnight at 180° E.

GMT: Greenwich Mean Time or UTC or Zulu, and is the time in Greenwich. Antonym: Local time. Berlin's local time = GMT + 1.

Date Line: The meridian which extents from the prime meridian. Here, not only the hour changes, but also the date.

Latitude: Position property defined by the number of degrees North or South of the equator, varies from 0° to 90°.

Longitude: Position property defined by the number of degrees East or West of the prime meridian, varies from 0° to 180°.

Position: Latitudes first and Longitudes second. For example: Nijmegen (NED) = 51° 50',1 N , 05° 52',0 E.

Nautical Mile: One nm is one minute (') on the chart. 1' equals 1.852 meters.

Knots: Nautical miles per hour.
« Last Edit: September 30, 2007, 07:57:25 am by Bianca2001 » Report Spam   Logged

Your mind understands what you have been taught; your heart what is true.


Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by EzPortal
Bookmark this site! | Upgrade This Forum
SMF For Free - Create your own Forum
Powered by SMF | SMF © 2016, Simple Machines
Privacy Policy