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If the clock number for the observed vessel does not change, it is on a collision course for the observer vessel, as vessels that pass by must change relative bearing. In warfare the clock system is especially useful in drawing attention to enemy locations. The clock system is easily converted into a 360 degree system for more precise denotation.
The angle is typically measured in degrees from the mark of number 12 clockwise. The time is usually based on a 12-hour clock. A method to solve such problems is to consider the rate of change of the angle in degrees per minute. The hour hand of a normal 12-hour analogue clock turns 360° in 12 hours (720 minutes) or 0.5° per minute.
The analemma is the narrow figure-8 shape, which plots the equation of time (in degrees, not time, 1°=4 minutes) versus the altitude of the Sun at noon at the sundial's location. The altitude is measured vertically, the equation of time horizontally. The simplest sundials do not give the hours, but rather note the exact moment of 12:00 noon. [78]
The ancient Greek mathematician and astronomer Oenopides used the phrase drawn gnomon-wise to describe a line drawn perpendicular to another. [8] Later, the term was used for an L-shaped instrument like a steel square used to draw right angles. This shape may explain its use to describe a shape formed by cutting a smaller square from a larger one.
Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding.The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation.
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Spurred by a low-pressure storm off Canada's Hudson Bay, the game-time temperature read -9 degrees, with incessant wind making it feel like -38 degrees (often cited as -59 degrees under the old ...
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