The Moving Moon

Even though it was a fairly detailed book on science and scientists during the Middle Ages, one paragraph took me back to something delightful I had experienced as a child.  The historian James Hannam writes:

"Children are often convinced that the moon is following them
 when they are travelling by car.  This is because, however far the car moves,
 the direction and size of the moon do not change at all.
 In comparison, all nearby everyday objects move across our field of vision
 as we approach and then pass them."

I remember that marvelous experience of watching the moon travel alongside us as I rode in the back seat of my parents' car.  (Although I did not tell them about it because it was such a wonderful secret!)

Even when I did not view that moving moon out of the side-window of a traveling car, I was sometimes moved by the moon's luminescence.  What a unique light it gave off, especially when full -- often a white light without being cold or piercing.  Like that light, our Earth's moon is one of a kind among our natural experiences here on Earth.

tides on an island

The moon affects us in other ways.  The moon's gravitational pull is the main cause of the movement of tides on shores.  Even ancient people noticed the harmony between the moon's returning to the sky and the height of tides.  But in the 17th century, when Galileo was trying to find proof that the Earth moved, he came up with the notion that the Earth's movements might instead be their cause.  The astronomer Johannes Kepler suggested to Galileo that the moon was indeed what caused tides, but Galileo dismissed the idea of an invisible force at a distance, and would not be budged from his own incorrect tide-theory.  Galileo even included in his famous book Dialogue his notion that the Earth's movement sloshed the tides about, even though other scientists pointed out that his hypothesis would result in only a single daily tide at spring, whereas two spring tides had been observed.

The moon is almost an inflection of the verb "to move":  The moon moves in its orbit, it is continuously moving the tides, and our hearts have been moved by it.

In this age of astronauts, we have reached the moon, but has the sight of the rising moon reached us?  The astronauts found the moon to be dry, gray, and dusty.  From here on Earth, it is beautiful and luminescent -- white, golden, or orange.

Even in our modern cities, in which light-pollution renders most stars invisible, we can often see the moon if we just look up.  With the constant barrage of news and advertising we are subjected to in our modern, technological societies, the days can go by in a blur of information and disinformation.  Perhaps we should pause some early mornings or evenings, look up at the moon, and be calmed by a recollection of its constancy, even with its changing faces.

~~~

Can you think of anything that -- like the moon -- remains constant even as it assumes different phases or forms?

(The quotation by Hannam is from The Genesis of Science:
How the Christian Middle Ages Launched the Scientific Revolution, © 2011, p. 274.)

(The first photo is by SeanMcClean; the second by さかおり. Both used under Creative Commons
 Attribution-Share- Alike licenses.)