By Isaac Asimov
Discusses the constellations and stars, the space, luminosity and dimension, stellar astronomy, starlight, and lifestyles on different planetary platforms, with specific connection with the 3rd brightest and likewise the closest big name. Alpha Centauri.
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Additional info for Alpha Centauri - The Nearest Star
As you move north you pass the one-degree parallel, the two-degree parallel and so on. " i"" N and 1° S. on Earth could be 10° N or 25° N or 77° N, or any number of degrees up to the north pole which is 90° N. It A spot could also be 10° S or 25° S or 77° S, all the way down to 90° S at the South Pole. Most spots on Earth are not, of course, exactly on a parallel of latitude, but rather between parallels. " A simpler method is to use decimals. 5° N. Every spot way on Earth has some latitude. 0000045° N.
It is possible to apply the system of parallels of latitude to people could see that was applied to the sky first, because the sky was a big sphere, while they could see only a part of the Earth and weren't sure, at the sky, too. ) There are parallels of latitude celestial drawn equator to each of the celestial poles, again with go degrees on each side. Every star can be said to be at some particular celestial latitude. " Instead of north and south, the signs for plus and minus are used. The equivalent of 40° N on earth is a declination of +40° in the sky, while 40° S on Earth is a declination of -40° in the sky.
61, which is barely short of the first-magnitude level. Of the four stars of the Southern Cross, two are first-magnitude and a third is nearly Crucis," has a Combining these with the quite close pair of stars Alpha Centauri and Beta Centauri, which are not far from the Southern Cross, you have a collection of five stars not matched anywhere else in the sky for brilliance and north- first-magnitude. — erners do not see it. 70 not far from first-magnitude. A little brighter, and it would give Orion three first-magnitude stars (though not as closely spaced as the three in Crux).
Alpha Centauri - The Nearest Star by Isaac Asimov