... Concerning those theories, Tycho believed that all planets revolved around the Sun, but the Sun circled Earth. ... That was when he published his first two laws of planetary motion: . ... Kepler's 3rd Law . ... Earth . ... Not only were Kepler's laws confirmed and explained by later scientists, but they apply to any orbital system of two bodies--even artificial satellites in orbit around the Earth. ... By Kepler's formula . ... More will be said about Kepler's first two laws in the next two sections...

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• Discovery of the Solar System
• Lagrangian Points

... The study of extra solar planets will be one of the most important areas of research in astronomy in this century. ... The first planets outside the solar system were found in 1992 around the millisecond pulsar PSR B1257+12 by Alex Wolszczan at the Arecibo Observatory . ... Three space missions based on this principle (MOST, COROT and Kepler ) have already been launched or approved, and have the last one at least has the potential to find Earth-sized planets. ... SIM ( NASA ) is one of such missions...

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Johann Kepler - a Legislator of the Sky. The laws of the planets movements put by Johann Kepler destroyed the thousand year old dogmas about the circles and spheres and opened the way to scientific understanding of celestial occurrences. ... The best object for observation was Mars - its orbit unlike the Earth's one has a noticeable eccentricity, the rotation period in comparison with Jupiter and Saturn is not too long and observation conditions are better than for Mercury and Venus. ...

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• antichnoste

... AMPLE (Adaptable Minor Planet Ephemerides) is integrated software package to deal with a number of problems concerning minor planets with the aid of IBM-type personal computer. ... compiling a list of all numbered minor planets which can be seen at certain moment within specified sky region and visualization of their mutual positions; . ... As AMPLE is able to reproduce virtually any table of "the Ephemerides of Minor Planets" , it may be considered as computer version of the EMP. ...

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• (Untitled)
• EPHEMERIDIES OF MINOR PLANETS (EMP)
• AY2016 (contents)

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . The Armagh Human Orrery is the first large-scale outdoor exhibit to show with precision on the ground the positions of the main planets, a dwarf planet and two comets. It is an innovative education and learning tool designed to explain the motion of the planets around the Sun and the changing position of Earth, relative to those planets, as it too revolves around the Sun. ... The Armagh Human Orrery . ...

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• Why this is interesting: reasons for which astronomers get very excited around
• Venus Transit Exhibition
• Searching for Planets Around Other Stars - from Galway: Monday 13 October 2008

... Advises . Contact Advises . As an advise for amateurs we would like to underline: if it's possible, try to observe 3 asteroid positions per night and do not neglect to observe the Numbered Minor Planets in your telescope field of view as a "by product" of your observational programs. ... We think such estimations ought to be produced every morning after CCD observations of the moving celestial objects by observer himself. ...

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... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• http://zebu.uoregon.edu/2003/hum399/brahesum.html
• http://zebu.uoregon.edu/51peggm.html
• Orbital Properties of the Solar System

HUBBLE SPACE TELESCOPE DAILY REPORT #931 PERIOD COVERED: 0800 EST Daily Status Report as of 198/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed FGS 5056 (High Speed Astrometry - A Search for Planetary Companions to Low Mass) The Fine Guidance Sensors were used to make astrometric observations of Bernard's star to look for the presence of a Jupiter sized planet in orbit around the target star from the position perturbations caused by the planet. ... Both observations were received. ...

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• Research Interests
• John H. Debes
• HST this week: 296

... Bad Astronomy . ... Mad Science . ... Site Info . ... Public Talks . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Who is this guy who calls himself "The Bad Astronomer?" ... First, yes, I am a real live astronomer (when people ask me what astronomers do, I tell them "They astronom !" ... These are emitted by powerful objects like black holes, exploding stars, and super-dense neutrons stars. ... Finally, am I really a bad astronomer? ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System
• Phil Plait's Bad Astronomy: Misconceptions

God Science Forum Message . ... God and Science | ... Pluto Is Not A Planet, But A Moon Of Neptune. ... Pluto Is Not a Planet, but a Moon of Neptune . 60 years ago, at 1947, the late Mohammed Ali Hassan Al-Hilly, said in his book: (The Universe and the Quran), that Pluto is not a planet but a moon of Neptune. ... He said: " Astronomers, however, think that Pluto is a planet, but I say it is merely a moon of Neptune, and actually it is not a planet. ... www.astronomy.net . About Astronomy Net | ...

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• Astronomy Terms - To Help You Study The Universe - an Astronomy Net Article
• Observational Stellar Astronomy - an Astronomy Net Article

... 9a. Earth orbits Sun? . ... Kepler's Laws . ... and First Law . ... Tycho was a Danish nobleman interested in astronomy. ... He even measured and took into account the very slight shift of star positions near the horizon, due to the bending of light in the Earth's atmosphere, similar to its bending in glass or water. ... Not only were Kepler's laws confirmed and explained by later scientists, but they apply to any orbital system of two bodies--even artificial satellites in orbit around the Earth. ...

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• Discovery of the Solar System
• Lagrangian Points
• The Scale of the Solar System

... Planets . ... Earth Satellites . ... Looking in the direction of the constellation Cygnus the Swan and launched by NASA in 2009 is the Kepler Space Observatory.Many previous missions searching for exoplanets mainly detected large giant planets, like large hot Jupiters (it is easier to detect larger planets).However KeplerтАЩs main objective is to search for much smaller planets located in a habitable zone which is not too close nor too far from their star; planets which may be just like our Earth. ...

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• Kepler-10c: the First Mega-Earth | Astronotes
• See giant planet Jupiter tonight | Astronotes
• Vulcan: ghost planet | Astronotes

The Discovery of the Galilean Satellites . ... Probably the most significent contribution that Galileo Galilei made to science was the discovery of the four satellites around Jupiter that are now named in his honor. Galileo first observed the moons of Jupiter on January 7, 1610 through a homemade telescope. He originally thought he saw three stars near Jupiter, strung out in a line through the planet. ... Galileo's Observations of Jupiter's Moons . ... Jupiter . ...

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• Dust evolution across the CO snowline in a protoplanetary disk
• Hubble Finds Oxygen Atmosphere On Jupiter's Moon Europa
• People

... Indiana Jones is a registered trademark of Lucasfilm Ltd. ... There's the intrigue of the megaliths of Stonehenge, the ancient pyramids of Egypt, the earthen figures of Britain and Peru, and the bloody rituals of the Maya. ... To make sense of these great structures and sophisticated concepts, archaeologists and astronomers have pooled their talents. ... People could use these alignments to synchronize their calendars or track the exact path of a celestial object. ... Maya glyphs of Venus. ...

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• ASP: Astronomy in the News
• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: The Story of the Transit of Venus

... January 31, 1996 . Planets Around Sun-Like Stars . ... The above plot summarizes the four known cases of normal stars having planets. ... The later two cases were discovered by astronomers led by Geoff Marcy and Paul Butler as part of a greater project inspecting 120 stars for orbiting planets. Interestingly enough, the planets around the later two stars have temperatures in the right range to allow liquid water - and hence may have conditions ripe for the development of life . ...

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• APOD: 2005 July 1 - Ring Around Fomalhaut
• APOD: 2008 November 28 - Probably a Planet for Beta Pic
• APOD: April 22, 1998 - HR 4796A: A Recipe for Planets

Computer Ephemeris. Ephemeris for physical observations of the planets. Explanations. Each row of the table contains for date specified at 0h of Time Terrestrial Dynamical: . ... position angle of axis of planetary rotation (degrees) - 'P', . ... illumanated part of the disk - k, . ... position angle of disk point with minimal illumination (degrees), . longitude of central meridian of the disk (degrees) - 'merid1' - system I and so... phase correction (degrees). ...

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... Deutsch . ... When a woman is pregnant, she's has to go for an ultrasound, where doctors look into her womb to check on the baby growing inside. Astronomers recently performed similar observations on a nearby star by accident! While looking into the gassy disk surrounding the star, they were surprised to see a baby planet growing inside! For the first time a planet has been seen at such an early stage of its life. ... This giant planet is over 10,000 times larger than Earth! ...

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• Comet Halley
• High Resolution HST Images of Pluto and Charon (ESO Press Release 09/94)
• First Rotation Period of Kuiper Belt Object Measured (ESO PR Photo 41/98)

New reduction of minor planets photographic plates obtained with Pulkovo Normal Astrograph A.A. Berezhnoy Pulkovo Observatory of RAS, Saint-Petersburg, Russia Minor Planet observations at Pulkovo Periodical observations of 14 bright asteroids named Selected Minor Planets (SMP) were performed at Pulkovo since 1948 within the international framework started by works of B.V. Numerov and D. Brouwer. ... 108 133 113 74 124 67 97 88 14 84 64 5 20 19 Epochs (YYYY.MM) 1200 Mean values of total obs. ...

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• Pulkovo Database of Observations of Minor Planets and Comets
• Pulkovo Database of Observations of Planets and Their Satellites

... Starting in the 1400s astronomers erected large instruments here to enable them to measure star and planet positions with increasing accuracy. ... A new star, likely the brightest supernova in recorded human history, appeared in planet Earth's sky in the year 1006 AD. ... Alpha Centauri: The Closest Star System . ... The closest star system to the Sun is the Alpha Centauri system. Of the three stars in the system, the dimmest -- called Proxima Centauri -- is actually the nearest star. ...

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... ARTICLE: The Adventurous Search For The Astronomical Unit . ... Kepler himself had suggested to use the rare occasions of Venus transiting (crossing) the solar disk to measure our distance to the planet. ... Due to the orbital inclination of Venus against the ecliptic of 3.5°, a Venus transit is so rare that it happens only at intervals of 121.5 years, 8 years, 105.5 years, 8 years and so on. ... Crabtree witnessing the transit of Venus 1639 . ... Transits of Venus - The Quest for the Solar Parallax...

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