○○○ synchronous ⪢⪢
Because the moon's period of rotation is equal to its period of revolution, that is to say, because the moon takes the same amount of time to spin as it does to orbit the earth, we from the earth only ever see one face of the moon.
http://qindex.info/i.php?x=14015

○○○ Paris ⪢⪢
The ghost of revolution still prowls the Paris streets. Down all the restless centuries it wanders incomplete. It speaks inside the cheap red wine of Cafe summer nights. Its red and amber voices call the cars at traffic lights. #song #lyrics
http://qindex.info/i.php?x=19655

• Rotation and Revolution
http://qindex.info/i.php?x=2905

• 28 Calculating the Volume of a Solid of Revolution by Integration
http://qindex.info/i.php?x=3425

◌◌◌ Revolutions
National Geographic
http://qindex.info/i.php?x=4751

• industrial revolution
http://qindex.info/i.php?x=15418

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