Talk:Kamal (navigation)

Comment

"Around this time (of the Discoveries) the Arabs were using a very ingenious instrument in the Mediterranean Sea that allowed them to know latitude. It was called al-kamal – the guiding line. It was simply a small wooden board with a notch made on top and in the middle of it and a piece of string that was attached to the centre of the board; it could only be operated at night. To find where they were, an operator would adjust the distance of the piece of wood closer or farther away from his eyes in order to have the bottom of the plank levelled with the horizon and the North Star placed inside the notch. The operator would then tie a knot in the string on the point where it touched his nose, and a celestial location was then marked. There were no angles to measure and record or complicated mathematical formulas to consider. From then on the navigator knew that every time the horizon was levelled with the bottom of the board, the North Star was inside the notch, and the distance measured in the string was the same as marked, he was in a place that had the same latitude as the one where he had made those measurements. Portugal had to wait for Vasco da Gama to bring it from India on the first voyage he made there in 1498."

This entire paragraph appears to be tacked on to the end of the article. It looks to have been simply copied from elsewhere, repeats information in the text and is not very neutral.

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Dates?

"Around this time (of the Discoveries) . . . " When was this? Is it a reference to the Age of Discovery? Urgos (talk) 03:12, 16 February 2013 (UTC)