The December solstice takes place when the sun reaches its southernmost point for the year. In 2016, it happens at 10:44 UTC on December 21. That means that, here in North America, the solstice falls in the early morning hours on December 21 (5:44 a.m. EST, 4:44 a.m. CST, 3:44 a.m. MST and 2:44 a.m. PST). Translate to your time zone here.
Looking at the world map below, you can see that the 2016 December solstice happens at sunset in the Pacific Ocean, after midnight in the Americas, sunrise in Africa and noontime in Asia.
Day and night sides of Earth on the December 2016 solstice
Day and night sides of Earth at the instant of the December 2016 solstice (2016 December 21 at 10:44 Universal Time). The shadow line going through northwest South America depicts sunrise and the shadow line passing through Asia represents sunset. Note that the north polar region of Earth has 24 hours of night, while the south polar region basks in 24 hours of daylight. Image via Earth and Moon Viewer
On the December solstice, we celebrate the (unofficial) first day of winter in the Northern Hemisphere and first day of summer in the Southern Hemisphere. Unofficial? Yes. Winter and summer start at the solstices by tradition, not official decree.
Yet these solstices bring very real occurrences to our sky, which you can witness for yourself. In both the Northern and Southern Hemispheres, the December solstice brings the southernmost sunrise and the southernmost sunset of the year. If you stand in one spot day after day, week after week – for example, gazing out a window toward the sunrise or sunset on the horizon – you will surely notice the sunset’s northward trek along the horizon over the coming months. From time to time, try fixing a bit of tape to the window on which you’ve written the date, to help you mark the sun’s passage.
In the Northern Hemisphere, the southernmost sunrise and sunset usher in the year’s shortest day and the longest night. In the Southern Hemisphere, it’s the exact opposite, for the year’s southernmost sunrise and sunset give the Southern Hemisphere its longest day and shortest night.
Do you love stargazing? Order your EarthSky Planisphere today!
Oliver Nagy made this cool image between the June and December solstices in 2014. The camera was fixed to a single spot for the entire exposure time, and it continuously recorded the sun’s path as glowing trail s across the sky. The breaks and gaps between the lines are caused by clouds. This image shows the shifting path of the sun over the months between a June and December solstice. As seen from the Northern Hemisphere, the sun’s path gets lower each day.
Earth has seasons because our world is tilted on its axis with respect to our orbit around the sun. Image via NASA.
Not everyplace worldwide has a sunrise and a sunset on the day of the December solstice. North of the Arctic Circle – or north of 66.5o north latitude – there is no sunrise or sunset today, because the sun stays beneath the horizon all day long. South of the Antarctic Circle – at 66.5o south of the equator – you won’t see a sunrise or sunset either, because the sun stays above the horizon all day.
View larger. | 2004 December solstice as viewed at the Lawrence Hall of Science in Berkeley, California, USA. Photo via Wikimedia.
After the sun reaches its southernmost point on the sky’s dome on the December solstice, watch as the sun seems to pause for a number of days before it starts its northward trajectory on the sky’s dome once again.
Bottom line: In 2016, the December solstice comes on December 21 at 4:44 a.m. CST. That’s December 21 at 10:44 Universal Time. It’s when the sun on our sky’s dome reaches its farthest southward point for the year. At this solstice, the Northern Hemisphere has its shortest day and longest night of the year. Happy solstice, everyone!
Winter solstice from Stonehenge
Donate: Your support means the world to us
from EarthSky http://ift.tt/2h6Nhx5
The December solstice takes place when the sun reaches its southernmost point for the year. In 2016, it happens at 10:44 UTC on December 21. That means that, here in North America, the solstice falls in the early morning hours on December 21 (5:44 a.m. EST, 4:44 a.m. CST, 3:44 a.m. MST and 2:44 a.m. PST). Translate to your time zone here.
Looking at the world map below, you can see that the 2016 December solstice happens at sunset in the Pacific Ocean, after midnight in the Americas, sunrise in Africa and noontime in Asia.
Day and night sides of Earth on the December 2016 solstice
Day and night sides of Earth at the instant of the December 2016 solstice (2016 December 21 at 10:44 Universal Time). The shadow line going through northwest South America depicts sunrise and the shadow line passing through Asia represents sunset. Note that the north polar region of Earth has 24 hours of night, while the south polar region basks in 24 hours of daylight. Image via Earth and Moon Viewer
On the December solstice, we celebrate the (unofficial) first day of winter in the Northern Hemisphere and first day of summer in the Southern Hemisphere. Unofficial? Yes. Winter and summer start at the solstices by tradition, not official decree.
Yet these solstices bring very real occurrences to our sky, which you can witness for yourself. In both the Northern and Southern Hemispheres, the December solstice brings the southernmost sunrise and the southernmost sunset of the year. If you stand in one spot day after day, week after week – for example, gazing out a window toward the sunrise or sunset on the horizon – you will surely notice the sunset’s northward trek along the horizon over the coming months. From time to time, try fixing a bit of tape to the window on which you’ve written the date, to help you mark the sun’s passage.
In the Northern Hemisphere, the southernmost sunrise and sunset usher in the year’s shortest day and the longest night. In the Southern Hemisphere, it’s the exact opposite, for the year’s southernmost sunrise and sunset give the Southern Hemisphere its longest day and shortest night.
Do you love stargazing? Order your EarthSky Planisphere today!
Oliver Nagy made this cool image between the June and December solstices in 2014. The camera was fixed to a single spot for the entire exposure time, and it continuously recorded the sun’s path as glowing trail s across the sky. The breaks and gaps between the lines are caused by clouds. This image shows the shifting path of the sun over the months between a June and December solstice. As seen from the Northern Hemisphere, the sun’s path gets lower each day.
Earth has seasons because our world is tilted on its axis with respect to our orbit around the sun. Image via NASA.
Not everyplace worldwide has a sunrise and a sunset on the day of the December solstice. North of the Arctic Circle – or north of 66.5o north latitude – there is no sunrise or sunset today, because the sun stays beneath the horizon all day long. South of the Antarctic Circle – at 66.5o south of the equator – you won’t see a sunrise or sunset either, because the sun stays above the horizon all day.
View larger. | 2004 December solstice as viewed at the Lawrence Hall of Science in Berkeley, California, USA. Photo via Wikimedia.
After the sun reaches its southernmost point on the sky’s dome on the December solstice, watch as the sun seems to pause for a number of days before it starts its northward trajectory on the sky’s dome once again.
Bottom line: In 2016, the December solstice comes on December 21 at 4:44 a.m. CST. That’s December 21 at 10:44 Universal Time. It’s when the sun on our sky’s dome reaches its farthest southward point for the year. At this solstice, the Northern Hemisphere has its shortest day and longest night of the year. Happy solstice, everyone!
Winter solstice from Stonehenge
Donate: Your support means the world to us
from EarthSky http://ift.tt/2h6Nhx5
Aucun commentaire:
Enregistrer un commentaire