By Philip Plait
Increase compliment for Philip Plait s undesirable Astronomy
"Bad Astronomy is simply simple stable! Philip Plait clears up each false impression on astronomy and area you by no means knew you suffered from." --Stephen Maran, writer of Astronomy for Dummies and editor of The Astronomy and Astrophysics Encyclopedia
"Thank the cosmos for the package of megastar stuff named Philip Plait, who's the realm s top purchaser suggest for caliber technological know-how in house and on the earth. this significant contribution to technological know-how will relaxation firmly on my reference library shelf, prepared for simple entry the following time an astrologer calls." --Dr. Michael Shermer, writer of Skeptic journal, per month columnist for medical American, and writer of The Borderlands of Science
"Philip Plait has given us a readable, erudite, informative, necessary, and pleasing ebook. undesirable Astronomy is nice technology. excellent science..." --James "The Amazing" Randi, President, James Randi academic beginning, and writer of An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural
"Bad Astronomy is a enjoyable learn. Plait is splendidly witty and academic as he debunks the myths, legends, and 'conspiracies that abound in our society. 'The fact Is Out There' and it's during this booklet. I enjoyed it!" --Mike Mullane, area go back and forth astronaut and writer of Do Your Ears Pop in Space?
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Additional resources for Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax"
It is not necessary that they be obtained on the same night, or even with the same telescope or camera. As long as appropriate standard stars of known photometric properties are observed on each night, it is possible to use those observations in training mode to derive the parameters α, . . , γ and/or δ, . . , η that characterize the instantaneous properties of the atmosphere and instrumentation in the relevent photometric bandpass(es). In application mode, for any given target object all the observed instrumental magnitudes v or b, each one accompanied by the values of α, .
Low-order polynomial expansions have the advantages that they are single valued, continuous, and smooth. In these properties they resemble the physical situations that we typically encounter. Classical δ-versus-є arguments can be used to show that a polynomial of some order can model the relevant physical situations to within any required tolerance. Polynomials have the further advantage that they are fast to compute. That said, there is no objection in principle to the use of other functional forms if they can be shown to produce improved fitting residuals without requiring additional free fitting parameters.
From this, it is apparent that if the stars appear to be exactly equally bright when measured in the standard V bandpass, then the blue star will be measured somewhat brighter than the red one in the Cerro Tololo V bandpass. Conversely, in another V filter that was shifted to a slightly longer wavelength than the standard bandpass, the red star would be measured somewhat brighter than the blue one. log Fλ ) , dλ 13 1 Astronomical Photometry U B V R I relative throughput (%) 8 6 4 2 0 600 λ (nm) 400 800 ⊡ Fig.
Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing "Hoax" by Philip Plait