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. $22.00, very good condition, Sold by 3rd St. Books rated 4.0 out of 5 stars, ships from Lees Summit, MO, UNITED STATES, published 2002 by Brohan Press.
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Very Good. Very good, clean, tight condition. Text is free of marks. Professional book dealer since 1999. All orders are processed promptly and carefully packaged.
Add this copy of Mars to cart. $25.68, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2020 by Hansebooks.
Add this copy of Mars [Easyread Edition] to cart. $27.01, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2006 by Read How You Want.
Add this copy of Mars [Easyread Large Edition] to cart. $29.68, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2006 by Read How You Want.
Add this copy of Mars to cart. $30.00, very good condition, Sold by Collins Books rated 5.0 out of 5 stars, ships from Seattle, WA, UNITED STATES, published 2002 by Brohan Press.
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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. $33.00, good condition, Sold by HPB-Red rated 5.0 out of 5 stars, ships from Dallas, TX, UNITED STATES, published 2002 by Brohan Press.
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Add this copy of Mars to cart. $36.37, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2010 by Kessinger Publishing.
Add this copy of Mars to cart. $36.82, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2004 by Kessinger Publishing.
Add this copy of Mars to cart. $40.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2004 by Kessinger Publishing.
