Lighthouses On Stamps

Yeah! me too,
So I cheated and went to Google

Once you know your height of eye you simply plug that into the following formula:

1.17 times the square root of your height of eye = Distance to the horizon in nautical miles

For example, let's say you are on the water in a friend's sport fishing boat and your height of eye is 9 feet above the surface of the water. The formula to calculate distance to the horizon is:

1.17 times the square root of 9 = Distance to the horizon in nautical miles.

1.17 * 3 = 3.51 nautical miles

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If you want to calculate the distance at which an object becomes visible, you must know your height of eye and the height of the object. You then do the same calculation for your distance to the horizon and the object's distance to the horizon and add the distances together. For example:

You have the same height of eye of 9 feet so your distance to the horizon is still 3.51 nautical miles. You're approaching a port that has a lighthouse that is shown on your chart to have a height of 81 feet. Using the same formula you would find that 1.17 times the square root of 81 (1.17 * 9) = 10.53 nautical miles (the light house can be seen 10.53 nautical miles over the horizon)

By adding the two together: 3.51 + 10.53 = 14.04 nautical miles, you should be able to see the lighthouse when you are 14.04 nautical miles away.

Rod, thanks for that interesting info.

Keep the pics coming everyone.

Steve

Propped up Lighthouse :

borrowed from:

http://www.lighthousestampsociety.o...ps/index.htm

Nice collection there Gussyboy1!

Paraguay stamps featuring Columbus Lighthouse.

My modest contribution (I don't think these have been posted to this thread yet)



A couple of lighthouses from Singapore. Horsburgh Lighthouse on the left, and Raffles Lighthouse on the right.

Found another lighthouse -

Would that be "porte paye" Miri, I wonder?

Iceland 1978
Centenary of Icelandic lighthouses

Guernsey 2007
A nice one!

Poland 1966
Hel

Poland 1969
Kolobrzeg