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My books
The Cry of the Sebac
The Cry of the Sebac - my new novel
Land of the Ever-Living Ones
Land of the Ever-Living Ones: my first work of fiction
Newgrange Monument to Immortality book
Newgrange: Monument to Immortality - click here
Island of the Setting Sun 2nd edition
"A fascinating insight into Ireland's ancient burial sites" - Irish Independent

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Established 16/3/2000
Some helpful illustrations
MoonThe ancient astronomical calendar - important datesMoon

The ancient astronomical calendar


MoonSunrises for important calendar eventsMoon
Sunrises for calendar events
MoonSun events plus Lunar standstills chartMoon
Important sunrise events plus lunar standstills

MoonSunswing - how the sun acts like a pendulumMoon
Sun swing

SWEEPING THE HORIZON

The Sun acts like a kind of giant pendulum as it moves from its winter rising position through the equinox towards its summer rising position. At the solstices, the Sun is rising in virtually the same place for a few days as it stands still - hence the word 'solstice', which comes from latin 'solstitium' which means 'Sun standing still'. As the weeks go by its rising position on the horizon changes more rapidly, and at the equinoxes, the Sunrise position is moving along the horizon at a rate of about half a degree per day - which is the equivalent of about one width of the Sun each day. The effect is that of a giant pendulum, swinging from one solstice to the other, slowing and stopping at each solstice, and moving quickest at the equinoxes. The above diagram is not accurate to scale, but gives a visual impression of the phenomenon. See this nice site for information about the solstice.


All information and photos, except where otherwise stated, copyright, © Anthony Murphy, 1999-2015
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