... The Seasons . ... Section #1 Stargazers and Skywatchers described the observed motion of the Sun across the sky, in different seasons of the year. ... If the Earth's axis were perpendicular to the ecliptic, as in the drawings here, the Sun's position in the sky would be halfway between the celestial poles, and its daily path, seen from any point on Earth, would stay exactly the same, day after day. Each point on Earth would be carried around the axis AB once a day. ... The Sun and Seasons . ...

... 2000 December 21 . Solstice And Season's Eclipse . ... This celestial event is known as a solstice, marking the beginning of Summer in the Southern Hemisphere and Winter in the North. But this year, the solstice will be followed, on December 25th, by another geocentric celestial event -- the last eclipse of the millennium ! The Christmas day eclipse will only be a partial one as the silhouetted disk of the Moon obscures the Sun's edge. ... About APOD | ...

... The December solstice brings the beginning of Winter to Earth's Northern Hemisphere and Summer time to the South! This view of Earth's Southern Hemisphere near the beginning of Summer was created using images from the Galileo spacecraft taken during its December 1990 flyby of our fair planet. ... Night and Day in Melas Chasma on Mars . ... Part of the answer comes from thermal imaging by the robot spacecraft 2001 Mars Odyssey currently orbiting Mars. ... IC 418: The Spirograph Nebula . ...

... Events . ... The orbit of the Moon is too small to be seen on this scale, but the 2008 December 1st alignment was especially interesting because additionally Venus was occulted by the Moon (this occultation was visible from Europe and NW Africa). Some more photos of the 1 December events received from Jonathan Bingham . ... Venus coming out from behind the Moon; photograph by Jonathan Bingham . ISS; photograph by Jonathan Bingham . ... International Year of Astronomy, Ireland National Node . ...

... Bad Astronomy . ... I think I will break from my usual format of Bad Astronomy/ Good Astronomy by saying that the way we define seasons currently is not strictly bad, but I feel (in my opinion!) that it could be better. The definition of when the seasons begin is at the moment of solstice or equinox; that is, winter (in the north) starts on December 22 nd and summer starts on June 22 nd . ... Now imagine breaking up the Sun's 46 degree up-and-down yearly swing into 1 day intervals. ...

NOVAC Newsletter - Reflections On 1982 . Articles | ... Richard Lawson . ... Attending this observation was Nils Thomas, John Huggins, Richard Lawson, Bob Koberg and his kids, David Edwards and Bryan Bloomer. ... Nils, John, Richard and A.J. Piccillo met for the July lunar eclipse. ... Twelve days later Nils, John, Richard, and Ian Babcock attended a scheduled NOVAC observation. ... Attending were Nils, John, A.J., Richard and Blaine Korcel. ... www.astronomy.net . About Astronomy Net | ...

... HST . ... Data . ... News and . ... HST Overview . Overview . ... HST Spectroscopy STIS/GHRS/FOS | ... Change of Supported Apertures for E230H Exposure Time Incorrect in Interrupted STIS Exposures CALSTIS 2.0 Released Improved Cosmic Ray Rejection Parameters for STIS New STIS Reference Files CCD Hot-Pixel Alert for STIS Spectroscopic Observations STIS Fringing Tutorial Now Available GHRS `poffsets' Task not Reliable for Weak Data FOS Paper Products Now Support Spectropolarimetry ...

... December 30, 1998 . Supernova 1994D and the Unexpected Universe . Credit: High-Z Supernova Search Team , HST , NASA . Explanation: Far away, long ago, a star exploded. ... Supernova 1994D was not of interest for how different it was, but rather for how similar it was to other supernovae . ... The large number and great distances to supernovae measured in 1998 have been interpreted as indicating that we live in a previously unexpected universe . ... About APOD > . ... NASA Technical Rep.: ...

... Sun images . ... Sun flares . ... Active areas . December : 2015 . ... The following regions with sunspots can be now observed on the Sun's surface . Group number . ... Group length (in degrees) . ... Coordinates and other characteristics of active regions are issued for December 09, 2015 00:31 UT The following H-alpha plages without spots can be currently observed on the Sun's surface . ... Coordinates and other characteristics of active regions are issued for December 09, 2015 00:31 UT . ...

... Archive for December 2010 . ... Posted by vlk . ... Tags: Bayesian , coin toss , priors . Category: Bayesian , Stat | Comment . ... Entries RSS . Comments RSS . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ... Entries (RSS) and Comments (RSS) . ...

National Aeronautics and Space Administration . Lyndon B. Johnson Space Center . ... William A. Anders (Major General, USAF Reserve, Ret.) NASA Astronaut (former) . ... EDUCATION: Received a bachelor of science degree from the United States Naval Academy in 1955 and a master of science degree in Nuclear Engineering from the Air Force Institute of Technology at Wright-Patterson Air Force Base, Ohio, in 1962. ...

The points are analogous to ones for the 4 th , 5 th , 6 th and 7 th Asian-Pacific Astronomy Olympiads . ... National Astronomy Olympic Committees and interested organizations are welcome to ask more about the 8 th APAO and in 2012 may form the teams for the 17 th IAO as well as for the 8 th APAO. The official APAO e-mail is a p a o [a] l i s t . ... Dr. Michael G. Gavrilov, Founding Chairman and Coordinator of the Asian-Pacific Astronomy Olympiad (APAO) . ... e-mail: gavrilov@issp.ac.ru . ...

... ESO Science Newsletter December 2015 . 17 Dec 2015 . ... This newsletter is a summary of recent ESO Science Announcement items. Follow the links or visit ESO Science Announcements to read more. ... Read more . ... The allocation of ESO telescope time for Period 97 (1 April БЂ“ 30 September 2016) is expected to be emailed in the week beginning 21 December 2015. ... ESO Workshop, ESO Headquarters, Garching, Germany, 27 June БЂ“ 1 July, 2016 . ... Joint ESO, ALMA, NAOJ, NRAO Workshop. ...

... Bacalaur degree from Moscow Institute of Physics and Technology . ... M.Sc. degree from Moscow Institute of Physics and Technology . ... Junior Research Associate, Institute of Radio Engineering and Electronics RAS, Moscow . ... Superconducting contact phenomena, dynamics of high-frequency interactions in Josephson structures . Current transport mechanism in YBCO bicrystal junctions on sapphire. ... Superconducting Current - Phase Dependence in Josephson YBCO Bicrystal.. ...

... It was designed to observe the solar wind approaching Earth, from a position near the Lagrangian point L1, and it is part of the International Solar-Terrestrial Physics (ISTP) Initiative . ... The original plan called for "Wind" to approach its final station over two years, undergoing two close encounters with the Moon to boost its speed. ... If however the object is moving , the encounter is not symmetric, and in the end the spacecraft may have gained or lost speed, depending on its trajectory. ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... November 9, 10, 11, 12 and 13 . December 6, 7, 8 and 9 March 24, 25, 26, 27 and 28 . ... December 3, 4 and 5 February 13, 14 and 15 . ... December 10, 11, 12, 13 and 14 . Incoherent Scatter Radar ionospheric parameters measurements are carried out on coordinated days determined by the International Geophysical Calendar. ...

Russian . ... text in Russian) . ... The Behaviour of the Bz Component of the Magnetic Field in Coronal Mass Ejections . ... Cooperation of IZMIRAN and Sternberg Astronomical Institute in the Study of the Sublimational Component of the Solar Coronal Radiation . ... Solar Wind and Magnetic Storms in the 24th Solar Activity Cycle . ... text in English) . ... The Solar Corona in the Light of TRACE Observations . ... Expeditions of Irkutsk Astronomers to Total Solar Eclipses in 1981--2012 . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... January . ... March . ... Posted on January 7, 2016 | 6 Comments Happy New Year! ... Continue Reading.. ... Posted on December 5, 2014 | ... Posted on March 13, 2014 | ... 2 Comments While the winter sky may be the тАШAladdinтАЩs caveтАЩ for skywatchers, and we may already have plundered deeply one of its greatest celestial treasures, the constellation of Orion, we forge [ ] . ... Posted on January 16, 2014 | ...

... Tte tables of ionosphere and plasmasphere parameters are contained in a file param.tbl. ... Latitude Longitude Numbers of tables for (degree) (degree) Month Wm=10 Wm=100 Wm= 150 80 30 March 1 - 3 397-399 793-795 80 150 March 4 - 6 400-402 796-798 80 270 March 7 - 9 403-405 799-801 60 30 March 10 - 12 406-408 802-804 60 150 March 13 - 15 409-411 805-807 60 270 March 16 - 18 412-414 808-810 40 30 March 19 - 21 415-417 811-813 40 150 March 22 - 24 418-420 814-816 40 270 ...

... The last quarter has seen Site Services continuing the installation of irrigation systems and new landscaping at the Visitor's Centre. ... The October 2000 term has been an interesting one in terms of operations at Parkes. ... The GPS systems at the Observatory are being upgraded to ensure the best possible long-term time reference is available for timing projects such as this. ... The influx of visitor interest was smoothly handled in the enlarged visitors centre, completed in August 2000. ...