Поиск по:www.iki.rssi.ru -
Поискать по всем серверам
На этой странице приведены все страницы сервера www.iki.rssi.ru ,которые мы индексируем. Показаны документы 6601 - 6620 из 7171.
Упорядочить по:
URL
|
дате изменения
6601. The Sun -- History
Large sunspots were occasionally seen far in the past without any instruments, when the sun was dimmed by thick haze, but not much was remembered of those observations. ... Sunspot Cycle (1850 - 1975) . One who was greatly influenced by Schwabe's discovery was an English gentleman of independent means, Richard Christopher Carrington , who devoted himself to the study of sunspots. ... Carrington had seen a flare, of the rare variety that is visible in white light (only about 50 are known). ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/EAMAGSPH/whsun.html -- 8.0 Кб -- 15.03.1999
Похожие документы
Похожие документы
6602. The Earth's Magnetosphere-- History
William Gilbert . The north-south pointing property of the compass needle was discovered in China around the year 1000, and in 1600 William Gilbert in London showed that this could be explained by the entire Earth being a huge magnet. As a model for the magnetic Earth he used a spherical magnet, which he called "terrella" , the "little Earth." He moved a small compass over the surface of the terrella and demonstrated that it always pointed towards its magnetic poles. ... Magnetic Fields . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/EAMAGSPH/whms1.html -- 4.5 Кб -- 15.03.1999
Похожие документы
Похожие документы
6603. Folding Paper Model of Magnetosphere
Below are instructions for making a simple paper model of the magnetosphere, out of a single sheet of paper. ... If the black-and-white image is used; optional.) If you wish, you can color different regions, such as: Plasma Sheet (including area marked "Plasma Convection?" ... The remaining area inside the magnetosphere (between plasma sheet and inner magnetosphere) can also be colored, and the region outside the magnetosphere (in the solar wind) may be left white or given a light color. ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/EAMAGSPH/wfold.html -- 4.6 Кб -- 15.03.1999
Похожие документы
Похожие документы
6604. FAQ: "Exploration of the Earth's Magnetosphere"
Reversals of the Earth's field (4 queries) . ... The Sun's magnetic poles . ... Magnetic field lines . ... Also, if you look up "Exploration of the Earth's Magnetosphere" you will see that the reason the Earth has a magnetic field is not any polarization, but electric currents flowing in the Earth's core. ... I hope you are aware that this is only one part in a much larger exposition, the Exploration of the Earth's Magnetosphere, dealing with the Earth's magnetic environment, with its home page at . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/EAMAGSPH/FAQ.html -- 67.5 Кб -- 15.03.1999
Похожие документы
Похожие документы
6605. Sun Picture List
small image in visible light 10k gif . ... A huge eruptive prominence leaving the sun 261k gif ; 203k jpg ; 6000k tiff . ... X-ray image of the Sun 172k gif . ... radio images of the Sun 140k gif . sun hydrogen alpha image 149k gif ; 34k jpg . Solar flare in H-alpha 147k gif ; 38k jpg . ... July 91 eclipse by Steve Albers ( caption ) 431k gif ; 143k jpg . ... Current solar images (updated daily) html ; html . eclipse images and movies ftp dir ; html from Goddard; html from Bernie Verreau . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/nineplanets/pxsol.html -- 7.6 Кб -- 11.03.1999
Похожие документы
Похожие документы
6606. How to tell a sine from a cosine
Triangles come in many shapes. ... Subtracting 90? from both sides . ... a / c = sin A -- "the sine (or sinus) of A" . b / c = cos A -- "the cosine (or cosinus) of A" . ... This statement is usually written with the square written sin 2 A (not sinA 2 , which might be taken to mean the sine of an angle equal to A 2 ): . ... The length of side a then approaches that of c , while the length of b becomes very small: therefore as A approaches 90?, sinA approaches 1 and cosA approaches zero. ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Strig2.htm -- 5.9 Кб -- 11.03.1999
Похожие документы
Похожие документы
6607. Deriving Sines and Cosines
Deriving the sine or cosine of an arbitrary angle takes a bit more math than is covered here. ... Note first of all that a right-angled triangle contains two angles. ... Because the side opposite to A is the one adjacent to (90?- A), it follows that the sine of one angle is the cosine of the other, and vice versa: . ... Consider the triangle PQR (drawing) with all three angles equal to 60?. ... If we want the angle A to grow in equal steps of 15 o , we still need the sine and cosine of 15? and 75?. ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Strig3.htm -- 9.1 Кб -- 11.03.1999
Похожие документы
Похожие документы
6608. Trigonometry beyond 90 degrees
... In polar coordinates, the point P is defined by its distance r from the origin O (see drawing) and by its polar angle ("azimuth" on a map) between the x-axis and the "radius" r = OA, measured counter-clockwise. ... When one or both are negative , the angle f is larger than 90 degrees, and such angles never appears in any right-angled triangle. ... There is a simple solution , though: use the above equations to re-define sin f and cos f for such larger angles! ... But it also works for larger angles....
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Strig4.htm -- 8.8 Кб -- 11.03.1999
Похожие документы
Похожие документы
6609. The Sine of the Sum of Angles
Given the functions (sin a , cos a , sin b and cos b ), we seek formulas that express sin( a+b ) and cos( a+b ). ... As shown in the drawing, to derive the formula we combine two right-angled triangles . ABC which has an angle a . ... AB = AC cos a = R cos b cos a The triangle ADF is right-angled and has the angle ( a+b ). ... Each of them is one of the two sharp ("acute") angles in its own right-angled triangle. ... In the right-angled triangle CED DE = DC cos a = R sin b cos a . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Strig5.htm -- 6.2 Кб -- 11.03.1999
Похожие документы
Похожие документы
6610. Tych Brahe
A site about Tycho, with a picture. Tycho was also known as "the man with the golden nose" because, having lost the tip of his nose in a duel, he crafted a replacement made of gold-plated brass. A portrait showing Tycho's distinguishing feature . In the Scientific American of February 1999, in its humorous section "Anti Gravity" (page 29) Steve Mirsky joked about that story: "...and the noseless man in question is the great Danish astronomer Tycho Brahe. ... Last updated 24 August 1998 ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Stycho.htm -- 3.0 Кб -- 11.03.1999
Похожие документы
Похожие документы
6611. The Sky Above Us
... And night unto night revealeth knowledge; . ... They noticed that the stars in that celestial canopy, the "firmament," maintained fixed patterns-- constellations --night after night. ... Like a globe, the sphere of the sky has two points around which it turns, points that mark its axis --the poles of the celestial sphere. ... The axis around which the Earth spins points in a certain direction in the sky, and that is also the direction of the pole star (or more accurately, the northern celestial pole...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Ssky.htm -- 11.0 Кб -- 11.03.1999
Похожие документы
Похожие документы
6612. Trigonometry--what it is good for?
... Sighting the telescope, first at the tree and then at pole B, you measure the angle A of the triangle ABC, equal to the difference between the numbers you have read from the azimuth plate.. ... Why triangles? ... One large surveying project of the 1800s was the " Great Trigonometric Survey " of British India. ... Everest was the one who commisioned and first used those giant theodolites; they are now on display in the Museum of the Survey of India in Dehra Dum. ... Everest . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Strig1.htm -- 9.4 Кб -- 11.03.1999
Похожие документы
Похожие документы
6613. Far-out Pathways to Space: Great Guns?
The SHARP cannon. Hydrogen is compressed . in the tube on top, the gun barrel is on bottom. ... Suppose the barrel of the cannon is a mile long ( @ 1600 meter) and the final velocity v , the one with which the shell emerges, is the escape velocity from the surface of the Earth . ... However, inert payloads (water, food, rocket fuel etc. ) could in principle be sent into space using a huge "super-cannon. ... Next Regular Stop: #31 Far-out Pathways to Space: Nuclear Power . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/SSHARP.htm -- 10.3 Кб -- 11.03.1999
Похожие документы
Похожие документы
6614. The Theorem of Pythagoras
... If a triangle has sides of length ( a,b,c ), with sides ( a,b ) enclosing an angle of 90 degrees ("right angle"), then . ... A diagonal cut divides it into two right-angled triangles with short sides a and b , and the area of such a triangle is therefore (1/2) ab . Now look at the square on the left constructed out of four ( a,b,c ) triangles. ... As the drawing on the right shows, that area can be divided into 4 triangles like the ones before, plus a small square of side ( a-b ). ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Spyth.htm -- 7.2 Кб -- 11.03.1999
Похожие документы
Похожие документы
6615. Orbits in Space
All space orbits obey the laws of Kepler and Newton. ... satellite TDRRS, used to relay . ... Ordinarily, a satellite's orbit is fixed in space, and as the Earth goes around the Sun, its orientation relative to the Sun constantly changes. ... By Kepler's 3rd law, a spacecraft going around the Sun in a circle smaller than the Earth's orbit will always have a shorter period and will move faster, and if launched from Earth its distance will grow until it and the Earth are well separated. ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Sorbit.htm -- 12.8 Кб -- 11.03.1999
Похожие документы
Похожие документы
6616. Mass
Galileo showed convincingly that heavy objects fell no faster that light ones. ... If an iron ball was pulled down with a much greater force than a wooden one of the same size, why didn't it fall any faster? ... 1) It is harder to lift. ... It is the fact that the loaded wagon has a greater mass that gives it a larger inertia , a larger tendency to oppose any change in its state of rest or of constant motion in a straight line. ... One important quantity was the body mass of the astronauts. ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Smass.htm -- 8.1 Кб -- 11.03.1999
Похожие документы
Похожие документы
6617. A Math Refresher
... The sections below are meant to refresh your memory about some basic ideas in algebra and trigonometry. Even if this material is completely new to you, with enough motivation and persistence you should be able to understand it. ... M-1) Basic ideas . ... M-5) Deriving Approximate Results . ... M-8) How to tell sines from cosines . M-9) Deriving sines and cosines . ... M-11) Deriving sin( a+b ), cos( a+b ) . ... Last updated 24 August 1998 ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Smath.htm -- 3.7 Кб -- 11.03.1999
Похожие документы
Похожие документы
6618. http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/SGbull.htm
... After 1945, Wernher von Braun made a successful transition to American patronage and, eventually, to civilian space exploration. ... It was the great dream of Bull's life to fire cannon projectiles from the earth's surface directly into outer space. ... In 1961, Bull established Project HARP (High Altitude Research Project). ... Bull's Space Research Corporation was manufacturing the necessary long-range shells in Canada, but his lack of American citizenship was a hindrance in the Pentagon arms...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/SGbull.htm -- 18.6 Кб -- 11.03.1999
Похожие документы
Похожие документы
6619. Glossary
Glossary -- Table of Contents . ... Angle of attack . ... Rotation axis of the Earth . ... Anomaly -- in orbital motion, one of the angles which gauges the motion of a planet or satellite around its orbit, increasing by 360 o every revolution. The true anomaly f equals the polar angle f in polar coordinates with origin at the center of the motion (e.g. Sun or Earth). ... Planets -- Celestial bodies such as the Earth which orbit the Sun (and by extension, similar orbiters around distant stars). ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Sgloss.htm -- 46.6 Кб -- 11.03.1999
Похожие документы
Похожие документы
6620. Hints to Users
These hints are for my own system--Netscape 3.01 on a Macintosh. ... You can make the text more legible by using a larger font: --On the menu bar, go to Options menu. ... To Disable Images --On the menu bar, go to Options menu. ... Disabling the images speeds up loading from the web--although in "Stargazers" images load quickly, most of them are small and have reduced palettes. ... You may send me questions at the e-mail address on the bottom of the page, and I will answer as many as time allows . ...
[
Сохраненная копия
]
Ссылки http://www.iki.rssi.ru/magbase/REFMAN/STARGAZE/Shints.htm -- 4.5 Кб -- 11.03.1999
Похожие документы
Похожие документы