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Search: id:A125560
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| A125560 |
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Decimal expansion of the solid angle (in degrees) of a sphere. |
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+0
1
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| 4, 1, 2, 5, 2, 9, 6, 1, 2, 4, 9, 4, 1, 9, 2, 7, 1, 0, 3, 1, 2, 9, 4, 6, 7, 1, 4, 6, 6, 1, 5, 5, 7, 2, 2, 6, 3, 9, 3, 3, 1, 9, 4, 0, 1, 7, 5, 9, 2, 6, 3, 1, 1, 5, 1, 5, 3, 9, 5, 3, 7, 5, 5, 8, 0, 0, 6, 6, 0, 4, 9, 9, 4, 6, 7, 9, 1, 5, 1, 7, 8, 9, 5, 3, 5, 7, 4, 9, 7, 6, 7, 7, 0, 1, 2, 7, 9, 9, 8, 7, 9, 8, 1, 4, 0
(list; cons; graph; listen)
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OFFSET
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5,1
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COMMENT
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"A 35 mm camera with a standard 50 mm lens covers an area some 38 degrees x 27 degrees. Theoretically, one can cover the sky with about 40 photographs." [A Field Guide]
One sphere = 4*Pi steradians, a spherical right angle = 1/4 hemisphere = 1/8 sphere = Pi/2 sterandian.
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REFERENCES
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John A. Adam, Mathematics in Nature, Modeling Pattern in the Natural World, Princeton University Press, Princeton & Oxford, 2003, page 78.
Patrick Kelly, Editor, Observer's Handbook 2007, The Royal Astronomical Society of Canada, page 32.
Donald H. Menzel, A Field Guide to the Stars and Planets, Houghton Mifflin Co., Boston, MA, 1964, page 317.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics, Solid Angle.
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FORMULA
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4Pi*(180/Pi)^2 = 10*A019694*A072097^2 = 129600/Pi = 129600/A049541.
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EXAMPLE
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41252.96124941927103129467146615572263933194017592631151539537558... degs.
=148510660.979093757126608172781606015015949846333347214554233520... mins.
=534638377792.4737525655789422013781654057419446800049972395240675... secs
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MATHEMATICA
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RealDigits[2^6*3^4*5^2/Pi, 10, 111][[1]]
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CROSSREFS
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Cf. A000796, A072097, A049541.
Sequence in context: A152523 A082903 A154589 this_sequence A046573 A006287 A087225
Adjacent sequences: A125557 A125558 A125559 this_sequence A125561 A125562 A125563
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KEYWORD
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cons,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 31 2006
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