| The_Naming_of_Stars Leaflet from Royal Greenwich Observatory. |
| Space_com_-_The_Greatest_Myths,_Hoaxes_&_Mysteries_in_Astronomy_and_Space_Science Article briefly discussing 21 topics. |
| Stars_and_Planets Information about interesting stars and planets in our galaxy, as well as astral bodies outside the Milky Way. Includes photos. |
| Planetary_Phenomena Historical account of conjunctions, occultations, and transits 3000 BC to 3000 AD. |
| Air_Movement_and_Control_Association Provides publications, membership, certified ratings program and seminars for manufacturers of air system equipment including fans, louvers, dampers, air curtains, airflow measurement stations, and ac |
| Chartered_Institution_of_Building_Services_Engineers_(CIBSE) UK-based institution for building services including heating, ventilation and air conditioning. |
| Cooling_Technology_Institute Nonprofit self-governing technical association dedicated to improvement in technology, design, performance and maintenance of cooling towers. Membership, publications, certification, and meetings. |
| Eastern_Michigan_ASHRAE Newsletter, calendar of events and the contact to the society's officers. |
| South_African_Institute_of_Refrigeration_&_Air_Conditioning Site gives details about the organisation including training courses, journals and data manuals. |
| The_Wichita_Chapter_of_ASHRAE This site describes the activities of the Wichita, Kansas chapter of the ASHRAE. |
| University_of_Illinois_at_Urbana-Champaign Student chapter overview, news, event and activity information, design projects, member resumes, officer list, mailing list, and membership information. |
| The_Aesthetics_of_Symmetry A brief digression into how people perceive symmetrical patterns -- what makes them boring, interesting, or overly intricate |
| Back_to_Square_One Includes description, solutions and other resources on this cube-like puzzle. |
| Critical_Math Articles and images on recreational math from fractals and magic squares to mathemorchids and Galois. |
| Cryptarithms_Online 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web. |
| CuriousMath Include news, math tricks, methods, facts, trivia, mostly posted by users. |
| David_Singmaster__List_of_Available_Material Teaching and recreational items in this personal collection. |
| The_Diamond_16_Puzzle New version of the classic puzzle using row/column/quadrant permutations to display symmetries of graphic designs. Has link to a site on the underlying mathematics (Diamond Theory). |
| A_Disproof_of_Pythagoras\'_Theorem? A method of disproving the Theorem of Pythagoras is presented. The author is adamant that this is intended only as a puzzle to find the mistake in the arguments, and not as a serious proposal. |
| The_Eugène_Strens_Recreational_Mathematics_Collection A special collection at the University of Calgary, including the archives of Martin Gardner. There is a searchable online index. |
| Eureka The annual journal of the Archimedeans, the mathematical society of the University of Cambridge. It regularly contains articles on recreational mathematics. |
| Fair_Dice Contains a complete list of all possible Fair Dice, most of which are not cubes. Includes pictures. |
| Famous_Curves Visual animations of famous curves. |
| Fast_Arithmetic_Tips Three categories: defensive - know to check an answer, offensive - fast mental calculations, and math magic. |
| Fibonacci_numbers_and_the_Pascal_triangle The relation between Fibonacci numbers and Pascal's triangle. English/German/Serbian. |
| Final_Answers Numerous facts including formulas, magic tricks, fallacies, recreations compiled by Dr. Gerald P. Michon. |
| Fun_With_Mathematics Includes pages on the topics of primes, fibonacci numbers, PI computation, data encryption and links to calculator programs. |
| Gardner_Index Rough index to the fifteen books containing Martin Gardner's Mathematical Games articles from Scientific American. |
| Geometric_Packing_Problems By Joseph Malkevitch: "Given one shape X how and when can one pack identical copies of this shape into another shape Y?" |
| HAKMEM A collection of problems from MIT. Work reported herein was conducted at the Artificial Intelligence Laboratory, a Massachusetts Institute of Technology research program. |
| How_To_Manually_Find_A_Square_Root The way to do find a square root without a calculator. |
| Iamond A page on polyiamond puzzles. Includes many pages on tessellation. |
| Jlpe\'s_Number_Recreations_Page Features original number recreations by the author, such as generalized perfect numbers, digital diversions, diophantine equations, didactic numbers, and number theory. |
| Look_and_Say_Sequence_Generator Creates a special kind of summation formula created by John Conway. |
| MAA_Library_List_in_Recreational_Mathematics Book list split into categories. Includes title, author, publisher and date information about each book. |
| MAT_007_I_News A newsletter edited by undergraduates of the Department of Mathematics at the University of Toronto. Includes some online copies. |
| Math_Forum__2001_Mathematics_Game A contest that asks to write all integers from 1 to 100 using only the digits 2,0,0,1 and arithmetic operations. |
| Math_Forum__2002_Mathematics_Game A contest where the contestants have to write all integers from 1 to 100 using only the digits 2,0,0,2 and arithmetic operations. |
| Math_Forum__Algebra_Problem_of_the_Week View this week's algebra problem or those of previous weeks. |
| Math_in_the_Movies A guide to major motion pictures with scenes of real mathematics. |
Sky GuideArticlesForum Latest Site Update: Observing Neptune and Uranus 
Neptune is at opposition on August 15 and is easily located from August through October. Neptune, along with the other three gas giants, Jupiter, Saturn and Uranus, all have diameters over 48,000 kilometres. (The other five “small” planets, including Earth, have diameters under 13,000.) Of Neptune’s known moons, only two are visible from Earth.Uranus, along with moons Titania and Oberon, are visible at a good mag. 6 from September to early December in Aquarius. Read more … The Great “Planet” Debate Continues Posted by BC on August 21st, 2008 
When is a “planet” not a planet, but an object in some other category? It depends on with which group you are associated.The IAU defined a “Planet” as having to : 1) Orbit a sun; 2) Have enough mass to draw itself into a round shape; and 3) Have enough mass to clear out its orbit through impact or scattering. Read more … Comment Here (0) Free Audio Lecture Series Posted by BC on August 21st, 2008 Some of us are fortunate in that we have access to conferences where we can go to hear programs on the latest research. Some of us are not as fortunate and have to rely on printed material for our information. Now we can go to a web site and download lectures by researchers presenting their findings. The downloads are free MPG files, and the topics are current. The lectures are more of a non-technical nature, so don’t think that they will be hard to understand. Read more … Comment Here (0) Competition to win Astrophotography Camera Posted by Marc on August 17th, 2008 
space="6" />The Imaging Centre is offering a DMK 21AU04.AS Astrophotography Monochrome Camera as a prize for those who can answer a straightforward question about the camera - a quick look at its specification sheet should help! You can enter at the Imaging Centre Competition website. Comment Here (0) X marks the spot Posted by BC on August 9th, 2008 
For those of you who like to observe the many features on the Moon, how many of you have seen the “X”? As you know the appearance of lunar features change as the Moon cycles through the phases. The “X” is one of those features, much like the Straight Wall, that is visible only during certain times. Read more … Comment Here (0) NASA, We Have Water Posted by BC on August 9th, 2008 
“We have water,” were the words of William Boynton of the University of Arizona when he announced findings from laboratory tests conducted my NASA’s Phoenix Mars Lander. The water was originally in the form of water-ice, which has been detected previously, but has never before been examined in the different phases from the same sample. Read more … Comment Here (0) Perseid Meteors - Early Sightings Posted by BC on August 2nd, 2008 
The Perseid Meteor Shower peaks on Tuesday morning (12 Aug), but it is already giving us a show. Last night (01/02 Aug) a couple of us were out looking at the sky when we saw several of the bright streaks in different areas of the sky. They were long tailed, but we did not see lingering vapor trails. The air was extremely humid, and only the brighter meteors could be seen.If you are interested in viewing the shower, even if you do not see the peak, you should go out any night for the next two weeks and look up. Of course you will see many more if you observe when the Moon is not up, but those we saw last night would still have been seen with a Full Moon. Comment Here (2) Total Solar Eclipse Update Posted by BC on July 30th, 2008 NASA has released an update on information for the solar eclipse that will occur later this week. For the link, go to the NASA site. Comment Here (0) Cool NASA Video of Earth and Moon Posted by BC on July 28th, 2008 Maybe you have not seen it yet, but some video of the Moon passing between Earth and the spacecraft Deep Impact gives us an extremely good view of what our planet and moon looks like from space. I could re-write the information, but you can go to the site yourself and take a look.Cool NASA Video. Comment Here (0) Dog Days of Summer Posted by BC on July 28th, 2008 
The Dog Days of Summer are upon those who live in the Northern Hemisphere. At least that’s what they call this time if year where I live in mid latitude of North America. Blistering heat (both sides of 100F), high humidity (60-100 relative), and random thunderstorms have been around all month, and weather predictions are for them to stick around for some time to come.Why are these days called Dog Days of Summer? Read more … Comment Here (0) « Older Entries Site Navigation Astronomy Space Exploration Cosmology Solar System Interviews Astrophotography Buying Telescopes Book Reviews Community Feature 
space="4" alt="answer questions" style="float: right;" height="66" width="45" /> Can you help with these astronomy questions? AstronomyToday.com's Sitemap Sign up for our free newsletter Search this site with Google: Web this site Copyright © 2000-2008, Astronomy Today. More Info: [ about this site ]_uacct = "UA-135799-1";urchinTracker();