Book Excerpt: ...does not measure the full extent of the variation in brilliancy. As the brightness of an illuminated body varies inversely as the square of its distance from the source of light, and as the total amount of light it reflects to an observer varies inversely as the square of his distance from it, it makes every difference in the apparent brilliancy of a body how the body is situated, both with regard to the source of light and with regard to the observer. Now it so chances that at the meetings of Mars with the ...
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Book Excerpt: ...does not measure the full extent of the variation in brilliancy. As the brightness of an illuminated body varies inversely as the square of its distance from the source of light, and as the total amount of light it reflects to an observer varies inversely as the square of his distance from it, it makes every difference in the apparent brilliancy of a body how the body is situated, both with regard to the source of light and with regard to the observer. Now it so chances that at the meetings of Mars with the Earth these two factors attain their maximum effects nearly together, and similarly with their minimum. For at the times when we are closest to Mars, Mars is nearly at his closest to the Sun, and reversely when we meet him at the opposite part of his orbit. It thus comes about that at some meetings, --oppositions, they are called, because Mars then is in the opposite part of the sky from the Sun, --the planet appears four and one half times as bright as at others. Here, then, we have the explanation of the p.
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Add this copy of Mars to cart. $24.41, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Dodo Pr.
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Very Good+ 228pp, octavo in salmon colored wraps; slight fading to spine, tight binding, covers and interior clean, dust jacket clean and without tears, in mylar cover, Very Good+.
Add this copy of Mars to cart. $30.95, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2004 by Kessinger Pub.
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Add this copy of Mars: Easyread Super Large 20pt Edition to cart. $32.66, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2007 by ReadHowYouWant.
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Good. Connecting readers with great books since 1972! Used textbooks may not include companion materials such as access codes, etc. May have some wear or writing/highlighting. We ship orders daily and Customer Service is our top priority!
Add this copy of Mars to cart. $33.00, very good condition, Sold by HPB-Ruby rated 4.0 out of 5 stars, ships from Dallas, TX, UNITED STATES, published 2002 by Brohan Press.
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Very good. Connecting readers with great books since 1972! Used books may not include companion materials, and may have some shelf wear or limited writing. We ship orders daily and Customer Service is our top priority!
