Question

Hey guys, Can anyone say how an astrolabe worked in the voyage at sea?​

Answer 1

Answer:

The instrument was used to help determine the ship's latitude from the height of the Pole Star or of the sun. At night, the Pole Star was sighted directly through small pinholes in the two vanes mounted on the pivoting alidade or rule. The altitude in degrees was then read off from the scale on the outer edge of the instrument. To measure the Sun's position during the day, the astrolabe was held below the waist and the alidade was adjusted so that a beam of sunlight passed through the top pinhole onto the bottom one.

Answer 2

Some of the early instruments used to assist sailors in determining latitude were the cross-staff, astrolabe, and quadrant. The astrolabe dates back to ancient Greece, when it was used by astronomers to help tell time, and was first used by mariners in the latefifteenth century. It was used to measure the altitude of the Sun and stars to determine latitude.

Around 1730, an English mathematician, John Hadley (1682–1744), and an American inventor, Thomas Godfrey (1704–1749), independently invented the sextant. The sextant provided mariners with a more accurate means of determining the angle between the horizon and the Sun, moon, or stars in order to calculate latitude.

During the sixteenth century, the chip log was invented and used as a crude speedometer. A line containing knots at regular intervals and weighted to drag in the water was let out over the stern as the ship was underway. A seaman would count the number of knots that went out over a specific period of time and the ship's speed could then be calculated.

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