Almost any sailor could tell what his longitude was by simply looking at a clock.

VOA: special.2010.07.14

Mister Harrison had to develop a clock that was not affected by the movement of a ship on the ocean or changes in temperature or atmospheric pressure.

VOA: special.2010.07.14

He was trying to build a clock that would help sailors learn longitude.

VOA: special.2010.07.14

The Rowans did not even have a clock.

VOA: special.2009.11.01

Susan Larson reads a scene from Nancy Drew's first adventure, "The Secret of the Old Clock": "Nancy struggled to get away.

VOA: special.2009.08.24

And everywhere was silence- the strange silence that comes only to a room where the clock has stopped ticking.

VOA: special.2010.05.15

Behind her,in the little room over the porch, a tiny clock ticked loudly on its shelf near the end of the bed.

VOA: special.2010.05.15

Two years later, in seventeen fifty-seven, he produced a small clock that he could hold in his hand.

VOA: special.2010.07.14

It was a little before one o'clock in the afternoon when Paul arrived at the Waldorf-Astoria hotel.

VOA: special.2009.04.11

The team was looking for a natural clock in the body that controls sleep and wakefulness.

VOA: special.2009.08.26

Last August,a study in the journal Sleep Medicine said children who go to bed after nine o'clock took longer to fall asleep and slept less.

VOA: special.2010.06.09

A little past one o'clock in the afternoon, a Confederate gun fired,once.

VOA: special.2009.11.05

Several years later, Mister Harrison built a second clock.

VOA: special.2010.07.14

A senior U.S.official acknowledges the clock is ticking on showing the effectiveness of America's multibillion dollar attempt to rebuild Afghanistan.

VOA: standard.2009.09.04

Lawmakers are working against the clock, with a month-long recess scheduled to begin in a matter of days.

VOA: standard.2009.07.28

It's four o'clock in the morning and the 68-year-old fisherman is dragging a plastic trunk of fish carcasses across the dock toward his boat.

VOA: standard.2010.07.20

The U.N.'s Yvo de Boer issued a stark reminder that the clock has run out.

VOA: standard.2009.12.08