WebOct 6, 1998 · One of these, The Periplus of the Erythraean Sea, a document written in the first century by a Greek merchant living in Alexandria, described trading routes as far east as India. By the 10th ... WebSep 5, 2009 · where h is the height above ground or sea level (in meters) of the eye of the observer. Examples: For an observer standing on the ground with h = 1.70 m (average eye-level height), the horizon is at a distance of 4.7 km. For an observer standing on a hill or tower of 100 m in height, the horizon is at a distance of 36 km.

How far can you see at sea? Calculate it - SA Mathieson

WebAug 1, 2024 · Apparently, this is the “old rule” used by Bowditch (American Practical Navigator) for calculating the values in Table 8, “Distance of Visibility of Objects at Sea” (at least up until 1943). A British book, Little Ship Navigation (1949), uses Inman’s Tables for values for “Distance of the Sea Horizon.” Inman apparently used the ... WebAt sea, the distance to the horizon is directly proportional to the square root of the elevation of the observer. If a person who is 36ft above the water can see 7.4mi, find … labor lawyers in san antonio texas

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WebThe human observer on dry land measures visibility by determining the greatest distance at which he can distinguish objects, ideally black, against the horizon sky with the unaided … Web1 day ago · RT @Iain643: A bus trip up to Montrose the other day. Sitting there looking out to my left, as far as you could see was fields growing food, looking to my right far out to sea to the horizon Wind turbines producing Renewable Energy How much does food cost & Energy bills cost in Scotland? 13 Apr 2024 20:07:55 WebMay 16, 2024 · This equation seems much more useful to determine the distance of your water horizon from a certain elevation on land above sea level. 6ft is 3 mile horizon 10ft … prominence health plan dentist