In Starry Realms
In Starry Realms
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In our eReader you can find the full English version of the book. Read In Starry Realms Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book In Starry Realms
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To quickly assess the difficulty of the text, read a short excerpt:
The only means we have of determining the period of rotation of a distant globe on its axis is by watching some mark or object on the globe, which we can recognise with certainty, and then observ- ing the time which it requires to go round to the oppo- site side, and back to where it was originally situated.
On Mars this process presents but little difficulty. There are many features on that globe which possess the desired attributes of definiteness and sharpness ; and accordingly the period of... rotation of Mars on its axis, or the day of that planet, is known with all desirable accuracy. It is known even to the fraction of a second, and it happens by a curious coincidence not to be very different from the length of our own day. A similar method can be applied to some of the other celestial bodies, though there are individual peculiarities which often give rise to difficulties. For instance, we know that the sun turns on its axis in about twenty-five of our days. This is learned by the observations of those spots by which the surface is fre- quently marked.
What to read after In Starry Realms?
You can find similar books in the "Read Also" column, or choose other free books by Robert S Robert Stawell Ball to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The only means we have of determining the period of rotation of a distant globe on its axis is by watching some mark or object on the globe, which we can recognise with certainty, and then observ- ing the time which it requires to go round to the oppo- site side, and back to where it was originally situated.
On Mars this process presents but little difficulty. There are many features on that globe which possess the desired attributes of definiteness and sharpness ; and accordingly the period of... rotation of Mars on its axis, or the day of that planet, is known with all desirable accuracy. It is known even to the fraction of a second, and it happens by a curious coincidence not to be very different from the length of our own day. A similar method can be applied to some of the other celestial bodies, though there are individual peculiarities which often give rise to difficulties. For instance, we know that the sun turns on its axis in about twenty-five of our days. This is learned by the observations of those spots by which the surface is fre- quently marked.
What to read after In Starry Realms?
You can find similar books in the "Read Also" column, or choose other free books by Robert S Robert Stawell Ball to read onlineMoreLess
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