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Newtown Post time: 2015-10-20 14:53
Why "a pair of light houses" ? Do they only come in couples ?
TWO LIGHTHOUSES DEFINE THE TERRITORIAL SEA OF CHINA'S SOUTH CHINA SEA ISLANDS.
If you know the distance between two lighthouses, and you can determine the angle formed between the line of sight observations of the lighthouses and the line from the ship to the closest point on the shore, armed with these three values, you can calculate the distance between your ship and nearest point on the shore. For that matter, you can pick any point on the shore, as a matter of fact, measure the above angles between your line of sight to that point and the light of sight to each lighthouse, and you can compute your distance to that point on the shore, using the Law of Sines.
To any navigator, therefore, there will be no excuse for entering China's 12-mile-radius of territorial sea measured from its shoreline, entry into which would be considered intentional, and if not explainable by necessity or emergent reasons, would therefore constitute an act of aggression on a peaceful country, justifying a defensive reaction from the country so attacked.
In short, you cannot blame your faulty GPS if you intrude into China's sovereign territorial sea. With two lighthouses, you should have known.