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1541. Magnification (Power) And Using Eyepieces - an Astronomy Net Article
Magnification (Power) And Using Eyepieces . ... To determine power in a telescope, divide the focal length of the telescope by the focal length of the eyepiece. By exchanging an eyepiece of one focal length for another, you can increase or decrease the power of the telescope. For example, a 25mm eyepiece used on a telescope with a 1000mm focal length would yield a power of 40x (1000 / 25 = 40) and a 10mm eyepiece used on the same telescope would yield a power of 100x (1000 / 10 = 100). ...
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Ссылки http://www.astronomy.net/articles/26/ -- 17.6 Кб -- 09.04.2016
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1542. Telescope Mounts - an Astronomy Net Article
Telescope Mounts . ... I just collected all the information I used in considering what kind of telescope mount I wanted and made a web page. ... A very important aspect to using a telescope is the mount. ... An altazimuth mount is a design to hold the OTA and allow the user to guide the scope by using two motions. ... The newest GOTO telescopes can do all of this without equatorial mounts and polar alignment because the computer can be programmed to know the position of the scope by using guide stars. ...
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Ссылки http://www.astronomy.net/articles/25/ -- 29.3 Кб -- 09.04.2016
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1543. Summer Triangle - an Astronomy Net Article
Summer Triangle . Articles | ... As dusk deepens into night in early June, look a bit north of east, not real high in the sky, for a sparkling blue-white star, whose name is Vega . ... Since the stars rise some four minutes earlier with each passing day, expect the stars of the Summer Triangle to light up the twilight dusk around middle to late June -- a sure harbinger of the change of seasons, of spring giving way to summer. ... Re-published on Astronomy Net with permission of the author. ...
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Ссылки http://www.astronomy.net/articles/24/ -- 15.5 Кб -- 09.04.2016
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1544. Harvest Moon - an Astronomy Net Article
Harvest Moon . ... The Harvest Moon refers to the Full Moon that comes closest to the autumnal equinox, or the first day of autumn. Depending on the year, the Harvest Moon can fall anywhere from two weeks before to two weeks after the equinox, which arrives annually on or near September 23. ... It was once common knowledge that at the vicinity of Full Moon, the Moon rises around sunset, shines all night long and sets around sunrise. ... Re-published on Astronomy Net with permission of the author. ...
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Ссылки http://www.astronomy.net/articles/23/ -- 14.3 Кб -- 09.04.2016
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1545. Signs Constellations Of The Zodiac - an Astronomy Net Article
Signs Constellations Of The Zodiac . Articles | ... The band of the zodiac is some sixteen degrees wide, extending about eight degrees north and south of what's called the ecliptic -- the Sun's path through the stars. ... Since that time, the March equinox Sun has shifted about thirty degrees westward through the constellations of the zodiac. ... While signs neatly extend eight degrees north and south of the ecliptic, aligning with the borders of the zodiac, constellations do no such thing. ...
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Ссылки http://www.astronomy.net/articles/22/ -- 15.8 Кб -- 09.04.2016
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1546. Lunar Libration - an Astronomy Net Article
Lunar Libration . Articles | ... Actually, a slight rocking motion, called libration,* makes about 59% of the Moon's surface visible from our planet Earth -- though only 50% at any one time. ... Add to that, the approximate 1.5 degree tilt of the Moon's equator to the ecliptic, and you have the inclination of the Moon's equator to the plane of its orbit around Earth at some 6.5 degrees (5 + 1.5 = 6.5). ... Re-published on Astronomy Net with permission of the author. ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/articles/21/ -- 14.8 Кб -- 09.04.2016
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1547. Blue Moon, What Is It? - an Astronomy Net Article
Blue Moon, What Is It? ... Moon | ... By popular acclaim, the second Full Moon of a calendar month is called a Blue Moon. ... If the last Full Moon of this calendar year comes after the December solstice but before New Year's Day, then it's inevitable -- the following year will have an "Old Style" Blue Moon. ... There are always thirteen Full Moons in a calendar year that hosts a "New Style" Blue Moon, and almost always twelve Full Moons during a calendar year that features an "Old Style" Blue Moon. ...
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Ссылки http://www.astronomy.net/articles/20/ -- 16.2 Кб -- 09.04.2016
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1548. Where On Earth Will The Sun Rise Earliest - an Astronomy Net Article
Where On Earth Will The Sun Rise Earliest . ... This imaginary circle around the earth at 66? 33' north latitude where the Sun is split in half by the horizon at noon during the winter solstice is called the Arctic Circle . ... So we are looking for a point on earth that is on or just barely west of the International Date Line (it has to be Saturday, January 1?not Friday, December 31) and on or just barely north of the Antarctic Circle, where the Sun rises from its brief arc below the horizon. ...
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Ссылки http://www.astronomy.net/articles/19/ -- 30.0 Кб -- 09.04.2016
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1549. Finding Himalia, The Fifth Brightest Moon Of Jupiter - an Astronomy Net Article
Finding Himalia, The Fifth Brightest Moon Of Jupiter . Articles | ... Himalia is the only moon other than the Galilean moons of Jupiter that is visible in an amateur size telescope. ... I normally use ?The Sky? from Software Bisque for planning my observing sessions and in helping me find objects, but it only has the Galilean moons for Jupiter so I used Red Shift (version 3 at the time) which I also had on my computer. ... www.astronomy.net . ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...
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Ссылки http://www.astronomy.net/articles/18/ -- 20.2 Кб -- 09.04.2016
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1550. Lurie-Houghton Telescope Design - an Astronomy Net Article
Lurie-Houghton Telescope Design . Articles | ... This was a major decision for me, especially in light of the complexities of this particular telescope design. ... The Newtonian telescope uses a paraboloidal mirror at the back end of the telescope tube to reflect and focus the light. ... The following figures compare the performance of the Lurie-Houghton telescope I designed to a Newtonian telescope with the same aperture and focal ratio. ... www.astronomy.net . About Astronomy Net | ...
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Ссылки http://www.astronomy.net/articles/17/ -- 31.3 Кб -- 09.04.2016
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1551. Polar Alignment Using The Star Drift Method - an Astronomy Net Article
Polar Alignment Using The Star Drift Method . Articles | ... This method with, a little practice, can give you reasonable polar alignment within one half hour. ... If the star drifts northward, your scope is west of the pole. ... Remember that as your adjustments get you closer to the pole, the star will drift slower and you must wait longer to detect a north-south drift. If the star drifts south, you are east of the pole and you must turn the mount towards the west. ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/articles/16/ -- 16.2 Кб -- 09.04.2016
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1552. NOVAC Newsletter - Reflections On 1982 - an Astronomy Net Article
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 | ...
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Ссылки http://www.astronomy.net/articles/15/ -- 15.4 Кб -- 09.04.2016
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1553. Observational Stellar Astronomy - an Astronomy Net Article
Observational Stellar Astronomy . Articles | ... We are made of star stuff" . ... TEMPERATURE OF A STAR: . ... The temperature of a star can be found out easily by simple observations. ... STAR . ... SPECTRAL CLASS: . All the stars in this universe are divided in to spectral classes based on their spectral lines. ... The spectral class of a star and the temperature of a star are related. So the spectral class can be found for a star since we know its temperature. ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/articles/14/ -- 17.1 Кб -- 09.04.2016
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1554. Midnight And Noon - an Astronomy Net Article
Midnight And Noon . Articles | ... Never call 12 Midnight, 12 a.m. Never call 12 Midnight, 12 p.m. Never call 12 Noon, 12 a.m. Never call 12 Noon, 12 p.m. Always refer to the 12 o'clock during the middle of the night as 12 Midnight . ... Hence to express the time from 12 noon to 12 o'clock at night, we use the term p.m. and from 12 o'clock at night to 12 o'clock noon we use a.m. However 12 o'clock midday is neither ante meridian or post meridian. ... www.astronomy.net . About Astronomy Net | ...
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Ссылки http://www.astronomy.net/articles/13/ -- 16.0 Кб -- 09.04.2016
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1555. "Back To The Astronomy Cafe" Book Review - an Astronomy Net Article
Back To The Astronomy Cafe" Book Review . Articles | ... Astronomy Net . ... A review of "Back to the Astronomy Cafe" . ... Pretty much near the Genesis of the modern Internet, Sten Odenwald has set out to help folks with questions about Astronomy by actually answering them. This book is the next in a series of common questions he has taken the time to answer in years past. ... www.astronomy.net . About Astronomy Net | ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...
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Ссылки http://www.astronomy.net/articles/11/ -- 13.6 Кб -- 09.04.2016
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1556. The Navy Prototype Optical Interferometer - an Astronomy Net Article
The Navy Prototype Optical Interferometer . Articles | ... John Huggins, October 1, 1998 . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...
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Ссылки http://www.astronomy.net/articles/10/ -- 11.9 Кб -- 09.04.2016
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1557. Seti Discussion Forum - Hosted by The Astronomy Net
Astronomy Discussion Forums . Forums: . ... God and Science · SETI · Software · UFO · XEphem . ... Discussion Forums . ... SETI a great idea and a complete waste - brooksquest - October 3, 2007 - 13:35 UTC . ... Tholzel - tholzel - September 12, 2003 - 14:11 UTC . Here's another way of looking at it - dnj23 - August 20, 2003 - 04:44 UTC . ... SETI and TESLA - stevec - November 30, 2002 - 10:40 UTC . ... TEAM SETI X - FILES - gcypher - August 17, 2002 - 17:17 UTC . ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/forums/seti/ -- 16.9 Кб -- 09.04.2016
[ Сохраненная копия ] Ссылки http://www.astronomy.net/forums/seti/?base=0&disp=0 -- 16.9 Кб -- 09.04.2016
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1558. Human Powered Clock Drive - an Astronomy Net Article
Human Powered Clock Drive . Articles | ... There are 86,400 seconds in a day and, if you, arbitrarily, want to rotate a knob once a minute like the second hand on a clock then you need a reducing gear ratio (or ratio of radii) of 1 to 1440. ... The "hour hand", which will naturally rest at the 6 o'clock(12hr clock military)position, is driven at the bottom of the hand by riding over a small diameter steel rod mounted at a 45 degree angle on the baseplate. ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/articles/9/ -- 22.3 Кб -- 09.04.2016
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1559. Your First Telescope - an Astronomy Net Article
Your First Telescope . Articles | AstroGuide | ... Adapted by Astronomy Net from http://www.scopereviews.com/ . ... Telescopes . ... How big is too big? ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...
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Ссылки http://www.astronomy.net/articles/7/ -- 12.1 Кб -- 09.04.2016
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1560. Moon, Planets And Aurora, Oh My! - an Astronomy Net Article
Moon, Planets And Aurora, Oh My! Articles | ... Moon | ... How often do we see several planets and the Moon together? ... Then I look northeast and see more red through all the light pollution of Washington, D.C. I snapped this 15 second photo. ... What started out as a father son photographic safari for rare planet conjunctions turned into a spectacular night of memories. ... Aha, I see some red light near Orion. ... A Very Rare Red Aurora in Northern Virginia, . ... www.astronomy.net . ...
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Ссылки http://www.astronomy.net/articles/6/ -- 16.7 Кб -- 09.04.2016
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