Elementary Astronomy; a Beginner's Text-book
Elementary Astronomy; a Beginner's Text-book
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In our eReader you can find the full English version of the book. Read Elementary Astronomy; a Beginner's Text-book 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 Elementary Astronomy; a Beginner's Text-book
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Of the abstract number, 93,000,000, we have no idea. It is far too Digitized by Google THE SOLAR SYSTEM. 273 great for us to have counted. We have never taken in at one view even a million similar discrete objects. The largest tree has less than 500,000 leaves. To count from 1 to 200 requires, with very rapid counting, 60 seconds. Suppose this kept up for a day without intermission ; at the end we should have counted 288,000, which is about j\j of 93,000,000. Hence over 10 months' uninterrupted... counting by night and day would be required simply to enumerate the number, and long before the expiration of the task all idea of it would have vanished.
We may take other and perhaps more striking examples. We know, for instance, that the time of the fastest express-trains between New York and Chicago, which average 40 miles per hour, is about a day. Suppose such a train to start for the sun and to continue run- ning at this rapid rate. It would take 363 years for the journey.
Three hundred and sixty- three years ago there was not a European settlement in America.
What to read after Elementary Astronomy; a Beginner's Text-book?
You can find similar books in the "Read Also" column, or choose other free books by Holden Edward Singleton to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Of the abstract number, 93,000,000, we have no idea. It is far too Digitized by Google THE SOLAR SYSTEM. 273 great for us to have counted. We have never taken in at one view even a million similar discrete objects. The largest tree has less than 500,000 leaves. To count from 1 to 200 requires, with very rapid counting, 60 seconds. Suppose this kept up for a day without intermission ; at the end we should have counted 288,000, which is about j\j of 93,000,000. Hence over 10 months' uninterrupted... counting by night and day would be required simply to enumerate the number, and long before the expiration of the task all idea of it would have vanished.
We may take other and perhaps more striking examples. We know, for instance, that the time of the fastest express-trains between New York and Chicago, which average 40 miles per hour, is about a day. Suppose such a train to start for the sun and to continue run- ning at this rapid rate. It would take 363 years for the journey.
Three hundred and sixty- three years ago there was not a European settlement in America.
What to read after Elementary Astronomy; a Beginner's Text-book?
You can find similar books in the "Read Also" column, or choose other free books by Holden Edward Singleton to read onlineMoreLess
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