The longitude of the GP is known as Greenwich Hour Angle - or GHA - in a reference to the correspondence between hours and longitude. We can determine, using a Nautical Almanac, the GP of a star (it's GHA and declination) in any moment of time. But we must know the exact time of the observation. The purpose of ascendant calculation it's to find the 'Sidereal Time' of the own birth, the sidereal time or 'stars's time' is defined as the time the earth needs to make one complete rotation around the stars and so it's useful to determine where are the stars in a given time, so knowing this figure at the time of the birth of a person it's possible 'to see' which are the rising costellation ...

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    They assemble a star chart to help identify Polaris in the night sky and then measure its altitude with the quadrant. Activity 3: Longitude and Time (Grade Level: 7 through 9).....21 How can we determine longitude? Students calculate time for different longitudes and record the results on a map of the world.

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    The use of 60 minutes per degree, and 60 seconds in each of those minutes dates has its origins in ancient Sumeria over 4,000 years ago. The ancient Sumerians devised what is known as the sexagisimal system, a method of counting using base 60 rather than base 10 which we use today.

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