A Plan for Securing Observations of the Variable Stars
A Plan for Securing Observations of the Variable Stars
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In our eReader you can find the full English version of the book. Read A Plan for Securing Observations of the Variable Stars Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Plan for Securing Observations of the Variable Stars
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Exceed one magnitude. Estimate the brightness of v in tenths of the inter- val from a to b. Thus, if v is midway between a and b the interval will be five tenths, and we may write a 5 b. If v is nearly as bright as a, we may have a 1 b or a 2 b ; if v is not much brighter than 6, we may have a 8 b or a 9 b. An advan- tage of this method is that larger intervals in brightness may be used between the comparison stars, and accordingly less distant stars employed. An increase in distance of the sta...rs always renders the comparison more difficult. We can also obtain many independent comparisons by using several comparison stars. If we have m stars brighter and n fainter, we shall only have m -\- n independent measures by the method of grades, while we may have m n comparisons by estimating tenths, since estimates may be made in terms of the intervals between each brighter and each fainter star. On the other hand, especially when observing stars not very near together, it is a decided advantage to have to com- pare two stars rather than three.
What to read after A Plan for Securing Observations of the Variable Stars?
You can find similar books in the "Read Also" column, or choose other free books by Pickering, Edward C. (Edward Charles), 1846-1919 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Exceed one magnitude. Estimate the brightness of v in tenths of the inter- val from a to b. Thus, if v is midway between a and b the interval will be five tenths, and we may write a 5 b. If v is nearly as bright as a, we may have a 1 b or a 2 b ; if v is not much brighter than 6, we may have a 8 b or a 9 b. An advan- tage of this method is that larger intervals in brightness may be used between the comparison stars, and accordingly less distant stars employed. An increase in distance of the sta...rs always renders the comparison more difficult. We can also obtain many independent comparisons by using several comparison stars. If we have m stars brighter and n fainter, we shall only have m -\- n independent measures by the method of grades, while we may have m n comparisons by estimating tenths, since estimates may be made in terms of the intervals between each brighter and each fainter star. On the other hand, especially when observing stars not very near together, it is a decided advantage to have to com- pare two stars rather than three.
What to read after A Plan for Securing Observations of the Variable Stars?
You can find similar books in the "Read Also" column, or choose other free books by Pickering, Edward C. (Edward Charles), 1846-1919 to read onlineMoreLess
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