Fun fact: lighthouses in a general area will all have different periods so sailors can easily tell them apart and know which one they are looking at

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pixelesque 6 hours ago | parent | next [-]

They also have different fog horn timings as well.

	▲	Razengan 5 hours ago \| parent [-]
		I say I say

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runarberg 5 hours ago | parent | prev | next [-]

Here is the Icelandic list of lights (isl. Vitaskrá). It includes every light in Iceland. Sailors are supposed to know how to read this and identify a light from their patterns. It is very rear that sailors sail by lighthouses these days though, but an extremely handy skill to have in case your GPS fails for some reason.

https://www.lhg.is/media/sjomaelingar_islands/Vitaskra_31101...

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ricksunny 6 hours ago | parent | prev [-]

sounds like pulsars.