Please refresh the page and try again. Stars aren't visible during the sunlit hours of daytime because the light-scattering properties of our atmosphere spread sunlight across the sky. My mother read a book written a few years ago, set in the American Civil War, in which an anecdote was put forth in passing that states “if a person stands in the bottom of a well during daylight hours and looks up he or she will see the stars.” Is this true? I think the limiting magnitude is 0, I thought that was how magnitudes work - that anything above 0 had positive luminance against the baseline? No, it sounds like someone is trying to trick you into a well, No, it's nonsense.
But the theory is wrong for two reasons.First, consider "contrast vision" - the ability to see a bright object against a fairly bright background. CCDs will register upwards of 90% of the incident light. That the sides of the shaft are dark will only serve to heighten the contrast presented to the viewer by the daylit sky. a silly myth. I once heard in an astronomy class that it is able to see a star in the day, but the light of the star has to fall directly in the mid-center of your eye, and that takes some doing. But the moon has no atmosphere. Future US, Inc. 11 West 42nd Street, 15th Floor, However, there are images taken by the Apollo crews with stars in them.
Probably the most likely explanation for this myth is that chimneys are designed to have a good updraft anyway. The stars are there but it is the sunlight that makes them difficult to see because it is so bright in comparison. The ratio of signal intensity (brightness in the case of light) between the faintest detectable signal and the point where your instrument maxes out (saturation) is called dynamic range, essentially the maximum contrast ratio. share. Seeing the dim light of a distant star in the blanket of photons from our Sun becomes as difficult as spotting a single snowflake in a blizzard. So much for the well of knowledge. originally appeared on Quora - the place to gain and share knowledge, empowering people to learn from others and better understand the world. You can read about other advantages of CCDs here: Advantages Of CCD Sensors (their stat on the dynamic range of film is a tad low). Moreover, Sirius would have to be directly above the viewer’s tiny opening, something those in the know have calculated as wildly improbable. This thread is archived.
Some telescopes now have “go-to” systems that make this much easier. Visit our corporate site. EY & Citi On The Importance Of Resilience And Innovation, Impact 50: Investors Seeking Profit — And Pushing For Change. https://www.snopes.com/fact-check/star-search/.
The background stars were not important to the Apollo crews’ studies of the Moon, so their exposure times were calculated to get the best images of Moon rocks, astronauts, landing sites, etc.
Your eye is every bit as inefficient, but at least it has a dynamic range closer to that of a CCD than to film. 2. So, yes, on Earth, the atmosphere is in fact the problem, because of Rayleigh Scattering. Rather, you’re applying the same principles to two different situations. Origins: There is a persistent belief that the stars in the heavens (which are masked from sight during the day by the light provided by the Sun) are easily viewable when regarded from the base of a very tall chimney or from the depths of a deep well or mine shaft. that is not true at all. The moon.
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