occulting
51Brant Point Light — Infobox Lighthouse caption = Brant point light in Nantucket harbor location = Nantucket, Massachusetts coordinates = coord|41|17|24|N|70|05|25|W|region:US type:landmark yearbuilt = 1746 yearlit = 1901 (current tower) automated = 1965… …
52Fort Queenscliff Lighthouse — Infobox lighthouse name=Fort Queenscliff Lighthouse location=Entrance to Port Phillip Bay, Australia caption= coordinates=coord|38|16|S|144|39|E yearlit=1862 yeardeactivated= automated= intensity= elevation=40 m range=convert|14|nmi|km|0… …
53Isophase light — An isophase light is a rhythmic light in which all durations of light and darkness are equal. It is normally used in light signals in lighthouses. Different lighthouses have different frequencies and not all are isophase and mariners can find out …
54Flashing light — A flashing light is a rhythmic light in which the total duration of the light in each period is clearly shorter than the total duration of the darkness and in which the flashes of light are all of equal duration. (Commonly used for a single… …
55Point Bonita Light — Infobox Lighthouse caption = location = San Francisco Bay, California coordinates = coord|37|48|56|N|122|31|46|W|region:US type:landmark yearbuilt = 1855 yearlit = 1877 automated = 1980 yeardeactivated = foundation = Masonry construction = Brick… …
56Santa Cruz Breakwater Light — Infobox Lighthouse caption = location = Santa Cruz Harbor, California coordinates = coord|36.9604|N|122.0023|W yearbuilt = 2001 yearlit = 2001 automated = 1941 yeardeactivated = foundation = construction = Reinforced concrete shape = height = 42… …
57Hudson-Athens Light — Infobox Lighthouse caption = Hudson Athens Lighthouse location = Hudson River, between Athens and Hudson coordinates = yearlit = 1874 automated = 1949 yeardeactivated = foundation = Granite caisson construction = Dressed Stone and red brick shape …
58Baker Shoal Range Front Light — Infobox Lighthouse caption = location = Port Penn, Delaware coordinates = yearbuilt = yearlit = automated = yeardeactivated = 1924 foundation = construction = shape = Square elevation = height = currentlens = lens = intensity = range =… …
59Phare de la Vieille — Infobox Lighthouse caption = Phare de la Vieille location = Raz de Sein, Finistère, Brittany, France. coordinates = coord|48|2|30|N|4|45|24|W|type:landmark yearbuilt = 1882 yearlit = 1887 automated = 1995 yeardeactivated = foundation =… …
60Woodman Light — Woodman Point …
