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Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
Outward Bound (OB) is an international network of outdoor education organisations that was founded in the United Kingdom by Lawrence Holt in 1941 based on the educational principles of Kurt Hahn. Today there are organisations, called schools, in over 35 countries which are attended by more than 150,000 people each year.
Nautical tourism, also called water tourism, is tourism that combines sailing and boating with vacation and holiday activities. It can be travelling from port to port in a cruise ship , or joining boat-centered events such as regattas or landing a small boat for lunch or other day recreation at specially prepared day boat-landings.
Abaft (preposition): at or toward the stern of a ship, or further back from a location, e.g. "the mizzenmast is abaft the mainmast". [1]Aboard: onto or within a ship, or in a group.
Nautical almanac used to determine the position in the sky of a celestial body after a sight has been taken. Parallel rules used for transferring a line to a parallel position. Also used to compare the orientation of a line to a magnetic or geographic orientation on a compass rose .
Nautical twilight begins when there is enough light for sailors to distinguish the horizon at sea, but the sky is still too dark to perform outdoor activities. It begins when the center of the Sun is 12 degrees below the horizon in the morning. Nautical dawn marks the start of nautical twilight, which lasts until civil dawn. [6] [5]