I love this book. There are so many concepts that seem to just flow effortlessly and that makes all the difference in grabbing onto a concept and having it almost instantly integrate. Kudos!
I did find one thing to mention. On page 39: "Note the moon doesn't spin."
This is incorrect. The moon has one rotation per revolution around the earth. In order for the same face of the moon to always be pointed at the earth, it has to do one rotation. Have someone be the "earth" and you be the "moon." As you revolve around the earth (always facing the earth), notice which walls you look at. Take that person out of the center and then face all four walls in succession. You will have rotated once.
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Reference: http://www.space.com/24871-does-the-moon-rotate.html
Does the Moon Rotate?
by Nola Taylor Redd, SPACE.com Contributor | February 28, 2014 08:39pm ET
Attentive observers on Earth might notice that the moon essentially keeps the same side facing our planet as it passes through its orbit. This may lead to the question, does the moon rotate? The answer is yes, though it may seem contrary to what our eyes observe.
The 'dark' side of the moon
The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. As a result, the moon does not seem to be spinning but appears to observers from Earth to be keeping almost perfectly still. Scientists call this sychronous rotation.
The side of the moon that perpetually faces Earth is known as the near side. The opposite or "back" side is the far side. Sometimes the far side is called the dark side of the moon, but this is inaccurate. When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.
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Perhaps there is a teensy tiny bit of Lorentz force in play???
I did find one thing to mention. On page 39: "Note the moon doesn't spin."
This is incorrect. The moon has one rotation per revolution around the earth. In order for the same face of the moon to always be pointed at the earth, it has to do one rotation. Have someone be the "earth" and you be the "moon." As you revolve around the earth (always facing the earth), notice which walls you look at. Take that person out of the center and then face all four walls in succession. You will have rotated once.
-----
Reference: http://www.space.com/24871-does-the-moon-rotate.html
Does the Moon Rotate?
by Nola Taylor Redd, SPACE.com Contributor | February 28, 2014 08:39pm ET
Attentive observers on Earth might notice that the moon essentially keeps the same side facing our planet as it passes through its orbit. This may lead to the question, does the moon rotate? The answer is yes, though it may seem contrary to what our eyes observe.
The 'dark' side of the moon
The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. As a result, the moon does not seem to be spinning but appears to observers from Earth to be keeping almost perfectly still. Scientists call this sychronous rotation.
The side of the moon that perpetually faces Earth is known as the near side. The opposite or "back" side is the far side. Sometimes the far side is called the dark side of the moon, but this is inaccurate. When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.
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Perhaps there is a teensy tiny bit of Lorentz force in play???