[□] □
[□=□] □
[□ & □] □
In this volume , Kepler developed his key argument that the physical body of the sun causes the planets to move as they do . In effect , your distance estimate depends on the angle between your line of sight to the horizon , which is at eye level , and your line of sight to the object of interest . In some sense , the group dynamics masked the " true " abilities of the individual pairs . It asked a judge to prohibit the companies from marketing the drink as a weight-loss beverage , and order them to refund consumers . At high volume , small disturbances can trigger congestion . At low volume , cars move more or less independently , achieve a preferred speed , and change lanes as required . Every night , the clock automatically checks the radio-delivered official time signal and makes whatever adjustments are necessary to stay synchronized .