... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

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Astronomy Picture of the Day . ... Advised by Alexandrian astronomer Sosigenes , Roman dictator Julius Caesar , pictured above in a self-decreed minted coin, created a calender system in 46 BC that contained one leap day every four years. ... This "Julian" calender system was used until the year 1582 when Pope Gregory XIII added that leap days should not occur in years ending in "00" except if divisible by 400, providing a further fine tuning. ... Publications with words: Julius Caesar - Leap Days . ...

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• Journal "Peremennye Zvezdy"
• Астронет > Julius Caesar and Leap Days

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. February 29, 1996 . Julius Caesar and Leap Days . ... Explanation: Today, February 29th , is a leap day - a relatively rare occurrence. Advised by Alexandrian astronomer Sosigenes , Roman dictator Julius Caesar , pictured above in a self-decreed minted coin, created a calender system in 46 BC that contained one leap day every four years. ...

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• APOD: 2000 February 29 - Julius Caesar and Leap Days
• APOD: 2016 February 29 - Julius Caesar and Leap Days
• APOD: 2004 February 29 - Julius Caesar and Leap Days

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Slacker Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Life Under the Moon . ... Seeing Jupiter's Moons . ... Time Zones and the Spherical Earth . A Companion to the Earth? ... December 19, 1999) . ... Big Moon, Little Moon . ... How Big is the Moon? ... 14, 2000) . ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! Talk about Bad Astronomy on the BA Bulletin Board! ...

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• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Misconceptions: Coast to Coast Am
• Phil Plait's Bad Astronomy: Mad Science

... Main . ... April 2016 . ... December 2015 . November 2015 . October 2015 . September 2015 . August 2015 . July 2015 . June 2015 . May 2015 . April 2015 . March 2015 . February 2015 . January 2015 . December 2014 . November 2014 . October 2014 . September 2014 . August 2014 . July 2014 . June 2014 . May 2014 . April 2014 . March 2014 . ... December 2013 . ... April 2013 . ... December 2012 . ... April 2012 . ...

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... The Round Earth . ... Aristarchus around 270 BC derived the Moon's distance from the duration of a lunar eclipse (Hipparchus later found an independent method). ... Let R be the radius of that circle and T the time it takes the Moon to go around once, about one month. ... Viewed from Earth, a "new Moon" (occuring between the time a thin crescent is last seen before sunrise and the time one is seen shortly after sunset) happens when the Moon in its apparent motion around the sky overtakes the Sun. ...

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• Millennium of Geomagnetism, References H-P
• FAQ: "The Great Magnet, the Earth"
• Flight to Mars: the Return Trip

... The Big Bang Theory:Our whole Universe was in a hot dense state, then nearly fourteen billion years ago expansion started.( ... 4-26 January:The Age of Reionisation, as the first galaxies form.The intense radiation they emit reionizes the gases spread through the surrounding Universe, ending the Dark Ages.From this point on, space becomes transparent and starlight can travel freely through space.The most distant galaxies in the celebrated Hubble Ultra Deep Field existed at the end of this era. ...

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• Monthly Sky Notes | Astronotes - Part 4
• Kepler-10c: the First Mega-Earth | Astronotes
• The One Year Crew | Astronotes

... For a timeline of the exploration of the magnetic environment of the Earth, Sun and Planets, see here . ... Galileo Galilei (1564-1642) builds the first astronomical telescope and observes for the first time craters on the Moon, satellites around Jupiter, and the way Venus goes through phases like the Moon (crescent, etc.) ... 17 December--First successful flight by the Wright brothers at Kitty Hawk, North Carolina. ... 16 March--Goddard launches his first liquid-fuel rocket. ...

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• FAQ: "The Great Magnet, the Earth"
• Galileo Finds Giant Iron Core in Jupiter's Moon Io
• Earth [Oulu]

... Transits do not happen every time Mercury passes between the Earth and Sun because their orbits are not in exactly the same plane, as we will see in this activity. ... Transits of Mercury occur at only two times during the year (but not every year). ... Can you tell which two months the orbits of Earth and Mercury are in line with the Sun? _____________________ and ________________________ [pic] ----------------------- ( Transits of Mercury occur at only two times during the year (but not every year...

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• http://www.astrosociety.org/edu/activities/mercurytransitorbit.pdf
• ASP: This Restless Globe
• ASP: Flattening the Earth

... Asteroid . ... In case you didn't hear about it, which you probably didn't: On Jan. 7, an asteroid 1,000 feet across -- nearly three times the current diameter of Marlon Brando -- barely missed the Earth, which is most likely your planet of residence. ... What if this asteroid had hit the Earth? ... As it happens, the American Astronomical Society was holding a conference in Washington AT THE VERY SAME TIME as the asteroid nearly hit the Earth. ...

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• Winer Observatory - Observations of Near Earth Asteroid 2008QT3

... The JSC History Portal offers access to the JSC History Collection , other JSC history materials, and hundreds of NASA history web pages. ... Johnson Space Center was established in 1961, and from the early Gemini, Apollo and Skylab projects to today's Space Shuttle and International Space Station Programs, the Center continues to lead NASA's efforts in human space exploration. ... JSC Space Shuttle Program . ... This link provides access to the NASA JSC History Portal Document Search page. ...

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• Astronaut Bio: Dale A. Gardner
• Astronaut Bio: Jay Apt 06/1997
• Astronaut Bio: Peter J. K. Wisoff 11/2001

... 2000 July 1 . Ultraviolet Earth from the Moon . ... Far UV Camera , Apollo 16 , NASA . Explanation: Here's a switch: the above picture is of the Earth taken from a lunar observatory! This false color picture shows how the Earth glows in ultraviolet (UV) light. UV light is so blue humans can't see it. ... The part of the Earth facing the Sun reflects much UV light, but perhaps more interesting is the side facing away from the Sun. ... Tomorrow's picture: July GRB . ... About APOD | ...