By Michael A. Seeds, Dana Backman
With this newly revised 9th version of STARS AND GALAXIES, the authors' ambitions are that can assist you use astronomy to appreciate science--and use technological know-how to appreciate what we're. interesting, attractive, and visually shiny, this article will assist you resolution basic questions: What are we? and the way will we recognize?
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Latitude 30° E Zenith North celestial pole W N S A few circumpolar constellations Cassiopeia Latitude 0° E South celestial pole Zenith Perseus Cepheus W N S Rotation of sky Rotation of sky Polaris Ursa Minor Latitude –30° E Circumpolar constellations are those that never rise or set. From mid-northern latitudes, as shown at left, you see a number of familiar constellations circling Polaris and never dipping below the horizon. As the sky rotates, the pointer stars at the front of the Big Dipper always point toward Polaris.
Were fainter, second-magnitude. The scale continued downward to sixth-magnitude stars, the faintest visible to the human eye. Thus, the larger the magnitude number, the fainter the star. This makes sense if you think of the bright stars as ﬁrst-class stars and the faintest visible stars as sixth-class stars. Ancient astronomers could only estimate magnitudes, but modern astronomers can measure the brightness of stars to high precision, so they have made adjustments to the scale of magnitudes. 34.
It is a characteristic of scientiﬁc knowledge that it is supported by evidence. A scientiﬁc statement is more than an opinion or a speculation because it has been tested objectively against reality. As you read about any science, look for the evidence in the form of observations and experiments. Every theory or conclusion should have supporting evidence. If you can ﬁnd and understand the evidence, the science will make sense. All scientists, from astronomers to zoologists, demand evidence. You should, too.