Download e-book for kindle: Navigating the Night Sky: How to Identify the Stars and by Guilherme de Almeida (auth.)

By Guilherme de Almeida (auth.)

ISBN-10: 1852337370

ISBN-13: 9781852337377

ISBN-10: 1852338989

ISBN-13: 9781852338985

From the reviews:

"The writer, who's a well known Portugese novice astronomer, methodically explains tips on how to realize the brighter stars and significant constellations and, therefore, how to define one’s means round the evening sky. … This e-book does an efficient task of doing what it units out to do. i like to recommend it to an individual who desires to discover the evening sky for the 1st time and know the way the evening sky noticeable to us adjustments through the evening and through the year." (Jocelyn Tomkin, The Observatory, Vol. one hundred twenty five (1186), 2005)

"The ebook is ready the way to establish the celebs and constellations … . This ebook includes a pleasant choice of cautious concept out diagrams which have compatibility in fantastically with the textual content … . i might particularly suggest it to anyone who's new to astronomy or as a reference e-book for the standard observer. … due to this publication … even the most recent observer may be off to a flying begin. … The language of the booklet is definitely obtainable … ." (Samuel George, Photopresse, factor: forty four, October, 2004)

"The e-book is concentrated at rookies to astronomy … . the publication is attention-grabbing and obtainable, the recommendations mentioned are effortless to appreciate and the content material flows obviously, with chapters on deciding on the constellations, stars and the celestial sphere. … the ebook closes with forty pages of appendices with plenty of helpful tables and information. The diagrams … are specifically transparent and concise … . This e-book will surely element the newcomer within the correct path! i'd suggest this useful consultant … ." (Mark Allison, well known Astronomy, July-September, 2006)

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Extra info for Navigating the Night Sky: How to Identify the Stars and Constellations

Example text

In this way, the matter later to become the star is compacted increasingly intensely, raising the temperature inside so high (10,000,000 Oe) that atomic nudei of hydrogen are able to combine, thus making helium nudeL This process is known as nudear fusion and releases energy: the star begins to shine. In these conditions the compression stops and the star enters a relatively stable and long-lasting stage of its life. While these reactions are taking place, the temperature inside the star goes up and the hydrogen used initially gradually dwindles.

Even to the naked eye, we quickly appreciate that these distant suns are differently coloured and of varying degrees of brightness. When it comes to brightness we are easily fooled: an apparently faint star may be highly luminous, but may not seem that way because it is so far away; another shining intensely in the sky, may in fact have only medium or faint brightness, but may stand out due its proximity. Let us look at an example: in the previous chapter we saw that "Polaris is not an especially bright star".

All ares have their eentre at the eelestial poles. All ares seen in the northern hemisphere are deseribed as having the celestial north pole as their centre. This coincides approximately with the position of Polaris, as deseribed above. We know that this is all a eonsequenee of the Earth's rotation and that this "movement of the stars" around our planet is pure illusion. Given that the sky appears to rotate around the eelestial poles, the eelestial pole that ean be seen (be it north or south depending on whereyou are) is at a eonstant altitude above the horizon.

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Navigating the Night Sky: How to Identify the Stars and Constellations by Guilherme de Almeida (auth.)


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