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Sky Tonight—January 5, Latest sunrises for mid-northern latitudes
Posted By admin On January 4, 2011 @ 5:30 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
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 If you like to sleep late but don’t want to miss the sunrise, this time of year should be your favorite. The latest sunrises of the year for mid-latitudes in the northern hemisphere are happening around now. For those in Wichita, Kansas, for example, the sunrise time for the next several days will be around 7:45 in the morning. Sleep on!
The December solstice always brings the shortest day. However, the latest sunrises do not coincide with the day of least sunlight.
The main reason is that the Earth’s rotational axis is tilted to the plane of our orbit around the sun. A secondary reason is that the Earth’s orbit is not a perfect circle. Due to our eccentric orbit, Earth travels fastest in January and slowest in July. Clock time gets a bit out of synch with sun time – by about the tune of 1/2 minute per day for several weeks around the December solstice.
If you are a skywatcher, you might know that this sequence of earliest sunset, shortest day, and latest sunrise never varies from year to year. For us at middle latitudes in the northern hemisphere, the earliest sunsets come in early December. The shortest day comes on the solstice around December 21, but the latest sunrises come in early January.
Written by Kelley Knight Heins 
Universe Today 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
Simostronomy Blog 
Amazing Space 
Scope City 
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URL to article: http://www.berthoudrecorder.com/2011/01/04/sky-tonight%e2%80%94january-5-latest-sunrises-for-mid-northern-latitudes/
URLs in this post:
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2011/01/phase05.gif
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2011/01/jan-05.jpg
 Earth comes closest to the sun in early January: http://earthsky.org/tonight/earth-comes-closest-to-sun-every-year-in-early-january
 Kelley Knight Heins: http://earthsky.org/author/Kelley%20Knight/
 Astronomy Picture of the Day from NASA/JPL: http://antwrp.gsfc.nasa.gov/apod/
 CHANDRA Photo Album: http://chandra.harvard.edu/photo/
 U.S. Naval Observator Astronomical Information cente: http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/astronomical-information-center
 Universe Today: http://www.universetoday.com/
 StarDate Online: http://stardate.org/
 Sky and Telescope: http://www.skyandtelescope.com/observing/ataglance/
 National Geographic: http://news.nationalgeographic.com/news/
 Space Com: http://www.space.com/nightsky/
 Simostronomy Blog: http://simostronomy.blogspot.com/
 Amazing Space: http://amazing-space.stsci.edu/tonights_sky/
 The York County Astronomical Society: http://www.ycas.org/tonights_sky.htm
 Scope City: http://www.scopecity.net/
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