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41 40 Anyone who has tried to make a model of how the Sun and Moon move around the sky will end up, most simply, with a circle of 28 markers around a central earth. Moving a Moon Pole one position per day and a SunPole once every 13 days, both anticlockwise, replicates the motions of the two luminaries around the Zodiac, and thereby provides an accurate calendar. Twice every year, for about 34 days, any full or new moon crosses the Suns apparent path in the sky the ecliptic and eclipses result. These two eclipse seasons, which are 173 days apart, move backwards around the calendar taking 18.6 years to complete a revolution. The two precise points where the Moon crosses the Suns path are called the lunar nodes. By doubling the 28 markers to 56, as found in the Aubrey Circle shown opposite, we can also incorporate the period of the lunar nodes. Conveniently, 18.6 x 3 is also almost 56, and eclipses may now be reliably predicted. Professor Sir Fred Hoyle was the first astronomer to comprehend this practical use for the Aubrey Circle. A full or new moon within the shaded eclipse zone predicts a lunar or solar eclipse. A lunar eclipse will always be visible at a given location if the Moon rises within the half hour before sunset. Why not build one of these at home Move the nodal markers clockwise three times a year, by one marker. These coincided with the midsummermidwinter axis on October 23rd 2001. predIctIng ecLIpSeS who nodes how holds power
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