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#1 The Glorious Revolution in England in the late 1600s saw the deposition of the Catholic king of England and Scotland, James Stuart, and his replacement by his daughter, Mary, and her husband, William of Orange. This triggered a number of uprisings in the British Isles, including the Williamite War in Ireland.

#2 The solstice marker at Newgrange, Ireland, is a physical cycle that repeats at regular intervals. It is the appearance of sunlight in the central chamber that provides a clear readout for a physical cycle that repeats at regular intervals.

#3 The sun moves across the sky from left to right, and the earth rotates counterclockwise. From a vantage point above the north pole, the earth rotates counterclockwise, so a day looks like the image on the next page.

#4 The sun follows a different path in the two hemispheres. At northern latitudes, the rising sun moves up and to the right, while at southern latitudes, it moves up and to the left. Only on the equator does the sun go straight up from the eastern horizon.

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