Experts credit the Greek astronomer Archimedes with developing the earliest known device to show the daily movement of the planets.

VOA: special.2010.09.29

The movement of businesses and people away from city centers led to the economic weakening of many downtown areas.

VOA: special.2010.01.11

Small changes in the movement of Neptune led several astronomers to believe that an undiscovered planet was affecting Neptune's orbit.

VOA: special.2010.07.11

These mechanical devices that show the relative placement and movement of the planets and moons are sometimes called orreries.

VOA: special.2010.09.29

The navigator also had to add any movement of the ship to the side caused by waves or the wind.

VOA: special.2009.12.23

It is cut with a list of important events marking the civil rights movement of the nineteen sixties.

VOA: special.2009.05.06

They did not build permanent structures to live in because they followed the movement of the animals.

VOA: special.2010.07.05

For many centuries, navigators hoped they could find longitude by observing the movement of stars at night.

VOA: special.2010.07.14

He knew they would continue to be a threat to the movement of Union troops and supplies.

VOA: special.2009.08.20

Rosa Parks and Martin Luther King,Junior had started a movement of non-violent protest in the South.

VOA: special.2009.03.08

"There it goes!" he said. He swung his camera up, following the movement of the flag, and pressed the button that took the picture.

VOA: special.2010.05.31

This improves the growth of roots and increases the movement of water through the soil.

VOA: special.2009.06.30

Experts explain that the movement of air in the atmosphere and natural qualities of the human eye caused him to see markings that were not there.

VOA: special.2010.07.11

Because the air has trouble moving, the movement of heat is greatly reduced.

VOA: special.2010.01.05