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December solstice

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Title: December solstice  
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Subject: Circle of latitude, Solstice, Winter solstice, December 2005, Yaldā
Collection: Astronomical Events of the Solar System, Calendars, December Events
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December solstice

UT date and time of
equinoxes and solstices on Earth[1]
event equinox solstice equinox solstice
month March June September December
year
day time day time day time day time
2010 20 17:32 21 11:28 23 03:09 21 23:38
2011 20 23:21 21 17:16 23 09:04 22 05:30
2012 20 05:14 20 23:09 22 14:49 21 11:12
2013 20 11:02 21 05:04 22 20:44 21 17:11
2014 20 16:57 21 10:51 23 02:29 21 23:03
2015 20 22:45 21 16:38 23 08:20 22 04:48
2016 20 04:30 20 22:34 22 14:21 21 10:44
2017 20 10:28 21 04:24 22 20:02 21 16:28
2018 20 16:15 21 10:07 23 01:54 21 22:23
2019 20 21:58 21 15:54 23 07:50 22 04:19
2020 20 03:50 20 21:44 22 13:31 21 10:02

The December solstice, also known as the southern solstice, is the solstice that occurs each December, typically between the 20th and the 22nd day of the month according to the Gregorian calendar. In the southern hemisphere, the December solstice is the summer solstice, whilst in the northern hemisphere it is the winter solstice.

Contents

  • Dates 1
  • Solar year 2
  • Human culture 3
    • Calendars 3.1
    • Commemorations 3.2
  • References 4

Dates

Recent past and future dates and times, in Universal Time, of the December solstice are: [2]

  • 2000-12-21 13:37
  • 2001-12-21 19:21
  • 2002-12-22 01:14
  • 2003-12-22 07:04
  • 2004-12-21 12:42
  • 2005-12-21 18:35
  • 2006-12-22 00:22
  • 2007-12-22 06:08
  • 2008-12-21 12:04
  • 2009-12-21 17:47
  • 2010-12-21 23:38
  • 2011-12-22 05:30
  • 2012-12-21 11:12
  • 2013-12-21 17:11
  • 2014-12-21 23:03
  • 2015-12-22 04:48
  • 2016-12-21 10:44
  • 2017-12-21 16:28
  • 2018-12-21 22:23
  • 2019-12-22 04:19
  • 2020-12-21 10:02

Solar year

The December solstice solar year is the solar year based on the December solstice. It is thus the length of time between adjacent December solstices.

The length of the December solstice year has been relatively stable between 6000 BC and 2000 at 49:30 (minutes:seconds) to 50:00 in excess of 365 days and 5 hours. After 2000 it is getting shorter. In 4000 the excess time will be 48:52 and in 10000 46:45.[3]

Human culture

Calendars

The figures in the charts show the differences between the Gregorian calendar and Persian Jalāli calendar in reference to the actual yearly time of the Southern solstice. The error shifts by slightly less than 1/4 day per year; in the Gregorian calendar it is corrected by a leap year every 4th year, omitting three such corrections in every 400 years, so that the average length of a calendar year is 365 97/400 days; while in the Persian calendar every eighth leap-cycle is extended to 5 years, making the average 365 8/33 days, shorter than the Gregorian average by one day every 13200 years.

The date of the solstice is not the same as the date of the latest sunrise and both are not the same as the date of earliest sunset. Because the Earth is moving along its solar orbital path, for each solar day the Earth has to do more than one full rotation. Because the Earth's orbit is elliptical, the speed at which the Earth moves along its orbit varies. Consequently, solar days are not the same length throughout the year. "Mean time" is the way of correcting this, making each day the same length, i.e. 24 hours. The maximum correction (see Equation of Time) is ± 15 minutes to the mean but its value changes quite rapidly around the solstices. If solar time were used rather than mean time, the latest sunrise and earliest sunset and therefore also the shortest day would all be at the solstice.

Commemorations

References

  1. ^ United States Naval Observatory (2010-06-10). "Earth's Seasons: Equinoxes, Solstices, Perihelion, and Aphelion, 2000-2020". 
  2. ^ Earth's Seasons — Naval Oceanography Portal
  3. ^ Bromberg, Irv. "Solar Year Length Variations on Earth". University of Toronto, Canada. Retrieved 21 December 2012. 
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