So each hour's time difference between the ship and the starting point marks a ship's progress of fifteen degrees of longitude to the east or west.

VOA: special.2010.07.14

Tuesday marks the eighth day of climate talks and with world leaders arriving, analysts say it is time to make serious progress with the major issues.

VOA: standard.2009.12.17

The launch of Duke Nukem 3D in the Android Market marks the first time any of the Duke Nukem titles are available on Android devices.

ENGADGET: Duke Nukem 3D is coming to Android, old rope shares soar Alt

This unprecedented turn of events marks the first time that individual investors in a money market fund are at risk for losing some of their principal.

NPR: Lehman Fallout Hits Money Market Fund

With less than 48 hours from start to finish, this marks the shortest period of time it has taken to plan and complete a spacewalk mission.

FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak