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The Journal of the AAVSO contains the results of research on variable stars. ... Read more

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Chapters: 2m1207b, Tw Hydrae, Hd 98800. Source: Wikipedia. Pages: 26. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: 2M1207b is a planetary mass object orbiting the brown dwarf 2M1207, in the constellation Centaurus, approximately 170 light-years from Earth. Notable as one of the first candidate extrasolar planets to be directly observed (by infrared imaging), it was discovered in April 2004 by the Very Large Telescope (VLT) at the Paranal Observatory in Chile by a team from the European Southern Observatory led by Gaël Chauvin. It is believed to be from 3 to 10 times the mass of Jupiter and may orbit 2M1207 at a distance roughly as far from the brown dwarf as Pluto is from the Earth's Sun. The object is a very hot gas giant; the estimated surface temperature is roughly 1600 K (1300 °C or 2400 °F), mostly due to gravitational contraction. Its mass is well below the calculated limit for deuterium fusion in brown dwarfs, which is 13 Jupiter masses. The projected distance between 2M1207b and its primary is around 40 AU (similar to the mean distance between Pluto and the Sun). Its infrared spectrum indicates the presence of water molecules in its atmosphere. The object is not a likely candidate to support life, either on its surface or on any satellites. Infrared image of 2M1207 (blueish)and 2M1207b (reddish). The two objects areseparated by less than one arc second in Earth's sky.Image taken using the ESO's 8.2m Yepun VLT.2M1207b is around 100 times fainter in the sky than its companion. It was first spotted as a "faint reddish speck of light" in 2004 by the VLT. Upon initial observation there was some question as to whether the objects might be merely an optical double, but subsequent observation by the Hubble Space Telescope and the VLT has shown that the objects move together and are the...More: http://booksllc.net/?id=1821329 ... Read more

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This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Subtitle: A Paper Read Before the American Historical Association at Its Second Annual Meeting, Saratoga, September 10, 1885; Original Published by: G. P. Putnam's sons in 1887 in 55 pages; Subjects: Comets; History / United States / General; Juvenile Nonfiction / Science ... Read more

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High Quality Content by WIKIPEDIA articles! The National Ground Water Association (NGWA), headquartered in Westerville, Ohio, is a membership-based nonprofit organization. Its mission statement reads: Dedicated to advancing the expertise of all ground water professionals and to furthering ground water awareness and protection through education and outreach. Its vision statement reads: To be the leading community of ground water professionals that promotes the responsible development, use, and management of ground water resources.Founded in 1948, NGWA currently has more than 13,000 U.S. and international members in its four membership divisions: water well contractors, scientists and engineers, manufacturers, and suppliers. ... Read more

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High Quality Content by WIKIPEDIA articles! Pierre François André Méchain (16 August 1744, Laon, Aisne ? 20 September 1804) was a French astronomer and surveyor who, with Charles Messier, was a major contributor to the early study of deep sky objects and comets.Pierre Méchain was born in Laon, the son of the ceiling designer and plasterer Pierre François Méchain. He displayed mental gifts in mathematics and physics but had to give up his studies for lack of money. However, his talents in astronomy were noticed by Joseph Jérôme Lalande, for whom he became a friend and proof-reader. Lalande then secured a position for him with the Naval Depot of Maps at Versailles, where he worked through the 1770s engaged in hydrographic work and coastline surveying. It was during this time -- approximately 1774 -- that he met Charles Messier, with whom he also became friends. In this year he also produced his first astronomical work, a paper on an occultation of Aldebaran by the Moon. ... Read more

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The Journal of the AAVSO contains the results of research on variable stars. ... Read more

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The Journal of the AAVSO contains the results of research on variable stars. ... Read more

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This is for 2 issues of the Portable Standard. One was published in 1974; the Cosmic Horizons was published in 1982. ... Read more

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Allowing students to make discoveries before they are asked to memorize facts, this text contains activities which offer experience in measuring variables and making astronomical observations. ... Read more

Customer Reviews (3)

Not for laymen!!!
If you are a scientist and can understand all the concepts in this book, then this book is for you. If you are a student who has been assigned this book, the best of luck to you. Perhaps Astronomy for dummies would have helped...

Not worth the money
The book was poorly writen, often repeating the same idea multiple times within a paragraph, making the material harder to understand due to sentice structure and unrelated tangents. While this book is required for someclasses, if you can get by without it, do so. Perhaps they will write abetter one soon.

new edition coming
A new edition will appear in summer 1999. The book has a new publisher, Kendall/Hunt.

the author ... Read more

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This book contains most of the papers presented at the G3 Symposium (Global and Gravity Field and Its Temporal Variations) sponsored by the International Association of Geodesy at the XXI General Assembly of the IUGG held in July 1995, Boulder, Colorado, USA. Four papers review the following areas: applications of global gravity models in geodesy and oceanography, high resolution gravity information in the oceans from satellite altimeter data, and temporal variations of the gravity field measured by terrestrial and satellite techniques. Other papers provide new results and future plans, for example, in the areas: global potental coefficient models, new terrestrial and altimeter-derived anomaly data, improved estimations Techniques, and use of GPS data in gravity field modeling. ... Read more

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"Is the sun down yet?!"

If you've never heard anyone say "I'm bored" on a Sabbath afternoon, you don't need this book!

But the rest of us...well, we'll be mentally high-fiving those creative people who've found ways to really celebrate God's special day!

In these pages are 101 of the best Sabbath activity ideas that Guide editors have ever seen--nearly two years' worth of fun! Some of these activities are great for groups, while others are perfect for solo ventures. And whether you plan ahead or flip through on the spur of the moment, you're sure to find something to make you smile, laugh, have fun, and learn about God! ... Read more