How Lighthouses Were Used
how lighthouses were used
Using an experience or example of when you were close to the beach, or on a cliff, in a house, in a hotel room?
In a lighthouse that is 120 feet high, a person sees a ship on the horizon. Due to the curvature of the earth, how far is the ship from the lighthouse? Use the formula: d = Ö[3h/2]
where d is the distance in miles and h is the height in feet.
Therefore, if h = 120,
d = Ö[3(120)/2]
d = Ö[3(60)]
d = Ö[180]
d = Ö[(36)(5)]
d = 6Ö[5]
d » 6(2.2361)
d » 13.4 miles
Using an experience or example of when you were close to the beach, or on a cliff, in a house, in a hotel room, etc., estimate how high above sea level you were and solve to see how far out you would be able to see a boat.
Try Makapu'u
http://www.lighthousefriends.com/light.asp?ID=141
http://www.nps.gov/maritime/light/hi.htm
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