Jim Gilbert's Nature Notes: Daylight's lowest ebb

  • Article by: JIM GILBERT , Special to the Star Tribune
  • Updated: December 19, 2013 - 3:56 PM

Astronomical winter begins in the Northern Hemisphere this year on Dec. 21 at 11:11 a.m., the exact moment our planet Earth is inclined 23½ degrees away from the sun at the North Pole. This point in time is called the winter solstice, when we experience our longest night and shortest day. On this first day of winter the sun is 22½ degrees above the horizon at noon in Mankato, 21½ degrees in Minneapolis and St. Paul, and only 18 degrees in International Falls. On this shortest day of the year, Winona receives about eight hours and 54 minutes of sunlight, the Twin Cities eight hours and 47 minutes and people in International Falls must get by with only about eight hours and 15 minutes.

Daylight is at its lowest ebb for the seven days between Dec. 18 and Dec. 24. This is due to the Earth’s elliptical orbit. At this point in its revolution around the sun, the Earth has slowed and things aren’t changing much. By Dec. 25 we will have regained a full minute of sunlight, and by Jan. 1 we’ll be enjoying an additional five minutes of light.

Even though the sun is at its lowest point in the sky on the winter solstice and from that day on our daylight increases, we won’t get our coldest days for another five weeks. Usually there is a lag time of 30 to 40 days after the period of minimum solar radiation, which allows the ground and air to cool as much as possible. Statistically, Jan. 25 is our coldest day of the year.

Jim Gilbert’s Nature Notes are heard on WCCO Radio at 7:15 a.m. Sundays. His observations have been part of the Minnesota Weatherguide Environment Calendars since 1977, and he is the author of five books on nature in Minnesota. He taught and worked as a naturalist for 50 years.

  • related content

  • How to ... track animals in the snow

    Thursday December 19, 2013

    BRAINERD, MINN. – Even the most perceptive human detects but a small fraction of the animals coming and going from...

  • get related content delivered to your inbox

  • manage my email subscriptions

Click here to send us your hunting or fishing photos – and to see what others are showing off from around the region.

ADVERTISEMENT

NY Mets - LP: J. Familia 6 FINAL
Miami - WP: A. Ramos 9
Philadelphia - WP: C. Hamels 7 FINAL
Atlanta - LP: J. Teheran 0
Boston - LP: B. Badenhop 3 FINAL
Tampa Bay - WP: G. Balfour 4
Minnesota - WP: P. Hughes 6 FINAL
Baltimore - LP: K. Gausman 4
Pittsburgh - LP: G. Cole 4 FINAL
St. Louis - WP: S. Maness 5
Milwaukee - LP: J. Nelson 2 FINAL
Chicago Cubs - WP: J. Turner 4
Detroit 5 Top 6th Inning
Cleveland 1
Seattle 1 Bottom 7th Inning
Oakland 6
San Francisco - WP: J. Affeldt 4 FINAL
Colorado - LP: C. Friedrich 2
Arizona 0 Bottom 5th Inning
San Diego 3
San Francisco 4 Bottom 1st Inning
Colorado 0
Washington - G. Gonzalez 7:10 PM
Los Angeles - R. Hernandez
Texas - C. Lewis 7:10 PM
Kansas City - Y. Ventura
Green Bay 9/4/14 7:30 PM
Seattle
Buffalo 9/7/14 12:00 PM
Chicago
New Orleans 9/7/14 12:00 PM
Atlanta
Minnesota 9/7/14 12:00 PM
St. Louis
Cleveland 9/7/14 12:00 PM
Pittsburgh
Jacksonville 9/7/14 12:00 PM
Philadelphia
Oakland 9/7/14 12:00 PM
NY Jets
Cincinnati 9/7/14 12:00 PM
Baltimore
Washington 9/7/14 12:00 PM
Houston
Tennessee 9/7/14 12:00 PM
Kansas City
New England 9/7/14 12:00 PM
Miami
Carolina 9/7/14 3:25 PM
Tampa Bay
San Francisco 9/7/14 3:25 PM
Dallas
Indianapolis 9/7/14 7:30 PM
Denver
Utah State 7 FINAL
Tennessee 38
SMU 0 FINAL
(10) Baylor 45
Miami-Florida 7:00 PM
Louisville
Arizona 9/4/14 7:00 PM
TX-San Antonio
Pittsburgh 9/5/14 6:00 PM
Boston College
Washington St 9/5/14 9:30 PM
Nevada
SMU 9/6/14 11:00 AM
North Texas
Fla Atlantic 9/6/14 11:00 AM
(2) Alabama
Buffalo 9/6/14 11:00 AM
Army
(24) Missouri 9/6/14 11:00 AM
Toledo
Arkansas State 9/6/14 11:00 AM
Tennessee
(7) McNeese State 9/6/14 11:00 AM
(22) Nebraska
Central Mich 9/6/14 11:00 AM
Purdue
Akron 9/6/14 11:00 AM
Penn State
Western Ill 9/6/14 11:00 AM
(14) Wisconsin
(20) Kansas State 9/6/14 11:00 AM
Iowa State
(4) Oklahoma 9/6/14 11:00 AM
Tulsa
Western Ky 9/6/14 11:00 AM
Illinois
SC State 9/6/14 11:30 AM
(16) Clemson
Navy 9/6/14 12:00 PM
Temple
UAB 9/6/14 1:00 PM
Miss State
South Alabama 9/6/14 1:00 PM
Kent State
New Mexico St 9/6/14 1:00 PM
Georgia State
Colorado 9/6/14 2:00 PM
Massachusetts
Fresno State 9/6/14 2:00 PM
Utah
(2) Eastern Wash 9/6/14 2:00 PM
(25) Washington
(15) USC 9/6/14 2:30 PM
(11) Stanford
Ohio U 9/6/14 2:30 PM
Kentucky
Middle Tennessee 9/6/14 2:30 PM
Minnesota
Northern Ill 9/6/14 2:30 PM
Northwestern
Missouri State 9/6/14 2:30 PM
Oklahoma State
Ball State 9/6/14 2:30 PM
Iowa
Maryland 9/6/14 2:30 PM
So Florida
Eastern Mich 9/6/14 3:00 PM
Florida
Georgia Tech 9/6/14 3:00 PM
Tulane
(18) Ole Miss 9/6/14 3:30 PM
Vanderbilt
Old Dominion 9/6/14 5:00 PM
NC State
(8) Michigan State 9/6/14 5:30 PM
(3) Oregon
(19) Arizona State 9/6/14 6:00 PM
New Mexico
Louisiana Tech 9/6/14 6:00 PM
Louisiana
San Jose St 9/6/14 6:00 PM
(6) Auburn
East Carolina 9/6/14 6:00 PM
(9) So Carolina
Duke 9/6/14 6:00 PM
Troy
Idaho 9/6/14 6:00 PM
ULM
(15) Sam Houston St 9/6/14 6:30 PM
(13) LSU
Michigan 9/6/14 6:30 PM
(17) Notre Dame
Lamar 9/6/14 6:30 PM
(21) Texas A&M
Northwestern St 9/6/14 6:30 PM
(10) Baylor
BYU 9/6/14 6:30 PM
Texas
Citadel 9/6/14 6:30 PM
(1) Florida State
San Diego St 9/6/14 7:00 PM
(23) North Carolina
Virginia Tech 9/6/14 7:00 PM
(5) Ohio State
Memphis 9/6/14 9:00 PM
(7) UCLA
Colorado State 9/6/14 9:15 PM
Boise State
Air Force 9/6/14 9:15 PM
Wyoming
Oregon State 9/6/14 9:30 PM
Hawaii
Texas Tech 9/6/14 10:00 PM
Texas-El Paso
Ottawa 10 FINAL
Montreal 20
Winnipeg 30 FINAL
Saskatchewan 35
Toronto 12 FINAL
Hamilton 13
Edmonton 10
Calgary 15
Indiana 71 4th Qtr 0:01
Chicago 71
Connect with twitterConnect with facebookConnect with Google+Connect with PinterestConnect with PinterestConnect with RssfeedConnect with email newsletters

ADVERTISEMENT

ADVERTISEMENT

ADVERTISEMENT

ADVERTISEMENT

question of the day

Poll: Should the lake where the albino muskie was caught remain a mystery?

Weekly Question

ADVERTISEMENT

 
Close