Printer Friendly

Sunset delay.

Get ready: October 30 marks the end of daylight saving time. But the fall ritual of turning the clocks back will soon be postponed by one week. The hope: That people will save energy by making better use of autumn's daylight hours.

Because Earth rotates on a tilted axis, the number of daylight hours on Earth varies during the year. When the planet's Northern Hemisphere tilts away from the sun--from September to March--the region experiences later sunrises, earlier sunsets, and fewer daylight hours. When the northern half of Earth tips toward the sun, it has more daylight hours.

In the early 1900s, officials and scientists said that people could save energy in the daylight-filled months if they set their clocks forward one hour. Why? When it's light out, you use less electricity to brighten your home. But early morning daylight is wasted because most people are asleep. So by "springing" clocks ahead, one energy-saving hour of sunlight shifts from the morning to the evening--when people are awake.

Hoping to save even more energy, the U.S. Congress recently passed a law extending daylight saving time starting in 2007. There's an added bonus, says David Prerau, a scientist who consulted with Congress on the new law: "Most people prefer to have the extra hour of evening light to do things after school or work."
COPYRIGHT 2005 Scholastic, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2005, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:EARTH/EARTH'S ROTATION; saving our daylight hours and energy use
Author:Norlander, Britt
Publication:Science World
Article Type:Brief Article
Geographic Code:1USA
Date:Oct 24, 2005
Words:223
Previous Article:Who's the fakes?
Next Article:Sweet sorrow.
Topics:


Related Articles
America the Endangered?
The moon that isn't there.
Science news resources.
To leap or not to leap: scientists debate a timely issue.
Saving daylight.
Timely suggestions.
In 2007, daylight-saving time to give off more light.
TICKTOCK, READY OR NOT, NEW DAY DAWNS.
BOMA's 10 ways to save energy.

Terms of use | Privacy policy | Copyright © 2022 Farlex, Inc. | Feedback | For webmasters |