Predicting Weather By The Moon - Xavier University Libraries
Predicting Weather By The Moon - Xavier University Libraries Predicting Weather By The Moon - Xavier University Libraries
WANING CRESCENT, Weather By The Moon In this phase, the Moon appears as a mirror image of the Waxing Crescent. Reduced to a thin banana shape, the gradually vanishing sliver can be glimpsed rising low in the east before Sunrise, before vanishing altogether for a couple of days as it becomes lost in the glow of the Sun’s light. We are at the month’s end, the disk is gone. When we see no Moon we speak of the ‘New Moon’, but this is a misnomer because it is not really renewed until we see its crescent again a few days later in the evening twilight. The whole phase process takes roughly 29 and a half days. In the past, weeks originated as quarters of this lunar cycle. If New Moon falls on a Sunday, so will 1 st Quarter, 3 times out of 4. Almost all cultures we are aware of throughout ancient history have set their farming clocks around the moon’s month. Crops were planted and harvested at particular phases. Later we will cover a little more fully how each of the four phases can affect the weather. But for now, we need to have a closer look at gravitation. 68
Tides and What pulls What The weather is nothing more than the Moon pulling the atmosphere around. Why it should do so is rather complex Newtonian physics, and how the weather around the world varies is due to the variations in the movements of the Moon. First we will examine the phenomenon of gravitational pull, and then what exactly is being pulled. Finally in this chapter we will discuss how this varies short and longterm. WHAT IS A TIDE? A common misconception is that the Moon revolves around the Earth, but actually the Moon and Earth revolve together around their common center of mass, or gravity. The two astronomical bodies are held together by gravitational attraction, but are simultaneously kept apart also by an equal and opposite centrifugal force produced by their individual revolutions around the center-of-mass of the Earth-Moon system. The centre-of-revolution of this motion of the Earth and Moon around their common centerof-mass(barycentre) lies at a point approximately 1,068 miles beneath the Earth’s surface, on the side toward the Moon, and along a line connecting the individual centers 69
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Tides and What pulls<br />
What<br />
<strong>The</strong> weather is nothing more than the <strong>Moon</strong> pulling<br />
the atmosphere around. Why it should do so is rather complex<br />
Newtonian physics, and how the weather around the<br />
world varies is due to the variations in the movements of<br />
the <strong>Moon</strong>. First we will examine the phenomenon of gravitational<br />
pull, and then what exactly is being pulled. Finally<br />
in this chapter we will discuss how this varies short and<br />
longterm.<br />
WHAT IS A TIDE?<br />
A common misconception is that the <strong>Moon</strong> revolves<br />
around the Earth, but actually the <strong>Moon</strong> and Earth revolve<br />
together around their common center of mass, or gravity.<br />
<strong>The</strong> two astronomical bodies are held together by gravitational<br />
attraction, but are simultaneously kept apart also by<br />
an equal and opposite centrifugal force produced by their<br />
individual revolutions around the center-of-mass of the<br />
Earth-<strong>Moon</strong> system. <strong>The</strong> centre-of-revolution of this motion<br />
of the Earth and <strong>Moon</strong> around their common centerof-mass(barycentre)<br />
lies at a point approximately 1,068<br />
miles beneath the Earth’s surface, on the side toward the<br />
<strong>Moon</strong>, and along a line connecting the individual centers<br />
69
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