The Weather Page

January 12, 2008|By FRANK ROYLANCE | FRANK ROYLANCE,Sun Reporter -- Weather Blogger

Bill Rooke, in Pasadena, wonders, "How far out in space does one have to go to be able to look back and see Earth as a sphere instead of a flat surface?" It depends on what you'll accept as "spherical." We get a hint of our almost-spherical Earth just watching ships sail over the horizon. High-altitude pilots and Concorde passengers say they can see the horizon's curvature clearly at about 60,000 feet. Astronauts might say it is whenever the planet appears smaller than their window.

Baltimore Sun Articles
|
|
|
Please note the green-lined linked article text has been applied commercially without any involvement from our newsroom editors, reporters or any other editorial staff.