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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 AD 2000, in the range of 49 minutes 30 seconds to 50 minutes in excess of 365 days 5 hours.
The winter solstice occurs during the hemisphere's winter. In the Northern Hemisphere, this is the December solstice (December 21, December 22, or December 23) and in the Southern Hemisphere, this is the June solstice (June 20, June 21, or June 22). Although the winter solstice itself lasts only a moment, the term also refers to the day on ...
21. 14:14. A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20-22 June and 20-22 December. In many countries, the seasons of the year are defined by reference to the solstices and the equinoxes.
First visit to a dwarf planet. [ 1] April: NASA 's MESSENGER to impact to Mercury. July: The ESA and NASA plan to launch the LISA Pathfinder spacecraft, a gravity research probe and technology testbed. July 14 – NASA's New Horizons spacecraft is expected to fly by Pluto and Charon and explore the area for five months, until the distance ...
The winter solstice and the moon's orbit both play factors in making December's full moon the longest of the year.
Subsolar point. The subsolar point on a planet is the point at which its Sun is perceived to be directly overhead (at the zenith); [1] that is, where the Sun's rays strike the planet exactly perpendicular to its surface. It can also mean the point closest to the Sun on an astronomical object, even though the Sun might not be visible.
In some cultures, the season is regarded as beginning at the solstice and ending on the following equinox. [16] [17] In the Northern Hemisphere, depending on the year, this corresponds to the period between 20, 21 or 22 December and 19, 20 or 21 March. [12] In an old Norwegian tradition, winter begins on 14 October and ends on the last day of ...
2014–15. The 2013–14 North American winter was one of the most significant for the United States, due in part to the breakdown of the polar vortex in November 2013, which allowed very cold air to travel down into the United States, leading to an extended period of very cold temperatures. The pattern continued mostly uninterrupted throughout ...