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The minimum height is calculated by trigonometry (see Distance to the horizon) as =, where H is the height above water in feet, and D is the distance from the lighthouse to the horizon in nautical miles, the lighthouse range.
The national flag of the United States, often referred to as the American flag or the U.S. flag, consists of thirteen horizontal stripes, alternating red and white, with a blue rectangle in the canton bearing fifty small, white, five-pointed stars arranged in nine offset horizontal rows, where rows of six stars alternate with rows of five stars.
One of the oldest working lighthouses in Europe is Hook Lighthouse, located at Hook Head in County Wexford, Ireland. It was built during the Middle Ages in a sturdy, circular design. A century later, in the Late Middle Ages, a 40-foot (12 m) tower was built by Edward the Black Prince at Cordouan near the Gironde estuary.
A triband is a type of flag which consists of three stripes arranged to form a flag. These stripes may be two or three colours, and may have an emblem in the middle stripe. [1] All tricolour flags are tribands, but not all tribands are tricolour flags, which requires three unique colours.
However, the Bennington Flag contains 13 stars and 13 stripes (to represent the colonies). The stars form an arch inside of a blue square at the top left corner of the flag, with the number "76 ...
One or more flags form a code word whose meaning can be looked up in a code book held by both parties. An example is the Popham numeric code used at the Battle of Trafalgar . In yacht racing and dinghy racing , flags have other meanings; for example, the P flag is used as the "preparatory" flag to indicate an imminent start, and the S flag ...
Each color, pattern, and design has its own specific meaning: for instance, the Philly Pride flag has two extra stripes, one black and one brown, to highlight people of color in the LGBTQ+ community.
Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. Different lights use different colours, frequencies and light patterns, so mariners can identify which light they are seeing. [1]