This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1858 Excerpt: ... visual angle will have the same apparent magnitude. Thus let A'n', fg. 366., be an object more distant than Ab, and of such a magnitude that its highest point A' shall be in the continuation of the line C A, and its lowest point B' in the continuation of the line C b. The apparent magnitude of A' B' will then be ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1858 Excerpt: ... visual angle will have the same apparent magnitude. Thus let A'n', fg. 366., be an object more distant than Ab, and of such a magnitude that its highest point A' shall be in the continuation of the line C A, and its lowest point B' in the continuation of the line C b. The apparent magnitude of A' B' will then be measured by the angle at c. This angle will therefore at the same time represent the apparent magnitude of the object A b and of the object A' B'. It is evident that an eye placed at c will see every point of the object A b upon the corresponding points of the object A' B'; so that if the object A B were opaque, and of a form similar to the object A' B', every point of the one would be seen upon a corresponding point of the other. In like manner, if an object A" B" were placed nearer the eye than A b, so that its highest point may lie upon the line C A, and its lowest point upon the line c-b, the object, being similar in form to A B, would appear to be of the same magnitude. Now it is evident that the real magnitudes of the three objects A" B," A B, and A' B', are in proportion of their respective distances from the eye; A' B' is just so much greater than A B, and A B than A" B," as C B' is greater than c b, and as c B greater than c B." Thus it appears that if several objects be placed before the eye in the same direction at different distances, and that the real linear magnitudes of these objects are in the proportion of their distances, they will have the same apparent magnitude. 1119. Case of the sun and moon illustrates this.--A striking example of this principle is presented by the case of the sun and moon. These objects appear in the heavens equal in size, the full moon being equal in apparent magnitude to t...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
