Two major reasons: the number of stars isn't really seven (it's many more), and they all have different brightnesses, so that you see more or fewer of them depending on viewing conditions. The brightness of stars is measured on the magnitude scale, where the most prominent stars in the sky are around 1st magnitude, and the faintest you can see with your eye are about 6th. ... I think this makes it quite likely that the list will be truncated at Taygeta, giving six visible stars. ...

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• Getting the Best Performance from the API
• telescope cycles by year
• ATOMS by Number

... Cycle 20 Phase II Proposal Instructions . HST Phase II Proposal Instructions for Cycle 20 > Chapter 5: Visits, Exposures and Exposure Groups > 5.14 Number of Times to Iterate the Exposure[Number_of_Iterations] . 5.14 Number of Times to Iterate the Exposure . Number_of_Iterations] . Choose the number of times the defined exposure is to be iterated; Choose 1 if only one execution of the exposure is desired. ...

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• Number of Times to Iterate the Exposure [Number_of_Iterations]
• Target Number [Target_Number]
• Examples of GHRS Phase II Proposals

... It may be desirable to apply (in addition to the source selection described above) some definite upper limit to the number of sources to be plotted - say, to plot only the first 50 brightest sources. Such a limit may be difficult or impossible to achieve by use of the expression parameter. ... The parameter ncutsortexpression has been provided to allow the sources to be sorted. ... slconv srclisttab=bert.ds:SRCLIST radiusexpression='RATE' withncut=yes ncutsortexpression='RATE' ncut=10 . ...

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• Number of papers published using different observatories
• ESO - A number of OmegaCAM filters show vignetting in their central regions.
• Number of papers published using different observatories | ESO

WCSLIB   5.15 . ... WCSLIB version numbers . ... In practical terms, this number becomes the major version number of the WCSLIB sharable library, libwcs.so.<major> . ... This becomes the minor version number of the WCSLIB sharable library, libwcs.so.<major>.<minor> . ... The sharable library should be installed as libwcs.so.<major>.<minor>, say libwcs.so.5.4 for concreteness, and a number of symbolic links created as follows: libwcs.so -> libwcs.so.5 libwcs.so.5 -> libwcs.so.5.4 libwcs.so.5.4 . ...

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• Number input
• NUMBER of PASSES
• ATNF Media Release - December 1, 1998

... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

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General Forum Message . Forums: . ... The Telescope's F/number . ... The f/number (focal ratio) of any telescope tells two things about the telescope and that is it's intended purpose and it's photographic performance. The brightness of a star depends on the telescope's aperture not the telescope's f/number. ... The f/number of any objective lens or a mirror of a telescope has nothing to do with the visual brightness of an image, the bigger the aperture the better. ... www.astronomy.net . ...

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• How Do You Feel About Numbers? - an Astronomy Net Exploration Forum Message
• Nothing? Beyond Numbers... - an Astronomy Net God Science Forum Message
• A Number Is A Very Specific Thing - an Astronomy Net Exploration Forum Message

... Organisers: Michel Balazard (CNRS, Laboratoire Poncelet) , Xavier Caruso (CNRS, Laboratoire Poncelet) , Michael Tsfasman (CNRS, Laboratoire Poncelet, Institute for Information Transmission Problems) , Alexey Zykin (Laboratoire Poncelet, State University Higher School of Economics) . ... Number theory seminar . ... One of the goals of the semester is to convey the essential unity of the subject, especially to young mathematicians who use number theory in their research. ...

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• The field of p-adic numbers and its finite extensions (Spring 2010)
• Algebraic Number Theory
• Conference "Algebraic Geometry and Number Theory"

... The numbers of three types of compact binaries containing accreting NSs and BHs, which are most interesting from the point of view of their observational appearances, have been calculated as a function of time: i) X-ray transient source containing a NS in an eccentric orbit around a main sequence Be-star (the observed prototype: A0535+26), ii) BH The evolution of the selected types of X-ray binaries during the first 10 million years after the starburst onset is presented in Fig. ...

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• The Number of Ejectors in Binaries
• The COOC Criterion (Criterion of Observations versus Calculations)
• Basic Observational Data for Determination of f(q) and

... Let us first find out which way -- rise in spectral resolution with some loss in the S/N ratio or increase in the S/N ratio with a fixed spectral resolution -- is better for the purpose of reduction of equivalent width determination errors. ... N -- number of counts for 1 ? ... line equivalent width, . ... Thus if the spectral resolution is managed to be increased (i.e. to decrease )without loss in the number of counts falling at 1 ?, the equivalent width measurement error is then proportional to . ...

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• Integer Functions, Random Number, String Conversion, Searching and Sorting:
• Time Functions
• Numbers of possible azimuths

... The described algorithm is suitable for measurements of complex images of stars. ... a) the zero-based number of stars in the complex (multicentric) image, . b) set of preliminary coordinates - x i , y i , for all stars, index i is number of a star, . ... i - index of a star in the complex image; . ... These parameters are calculated by a nonlinear method of a least squares.The main output parameters of this algorithm are x i , y i ; where the index i is number of a star in the multicentric image. ...

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... Forum: The Linux Kernel Hackers' Guide . ... Keywords: kernel tuning, file handles, Bus error . ... Increasing number of open file handles in kernel. I have successfully increased the number of files on my system (Linux 2.0.30) by editing the following file: . ... I also increased NR_INODE to 5000, and NR_FILE to 4096. I then rebuilt the Kernel (and modules for good measure) and installed the new image. ... Increasing number of open files parameter by Simon Cooper . ...

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• Can register_*dev() assign an unused major number?
• Register_*dev() can assign an unused major number.
• How to print floating point numbers from the kernel?

... The absolute magnitude of the RCBs in the LMC and the small number of Galactic RCBs implies that they are very rare stars. Together with statistics for related stars, the total number of hydrogen-deficient stars in the Galaxy is estimated to be about 1000 ([ Warner 1967 ]). Whilst the luminosity of RCBs is similar to that of other low-mass stars as they evolve rapidly from the asymptotic giant branch to become white dwarfs, their frequency is much lower. ...

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• Measuring Internet Access
• IAJ: Contents - Volume 23 Number 1
• IAJ: Contents - Volume 23 Number 2

... This year SSAU provides 1429 state-funded places for admission in all kinds and directions of educational programs. ... In addition, SSAU Admission Committee notes the substantial increase in interest from the foreign applicants this year. The number of applications from foreign countries has already surpassed last year's totals - 76 applications. Based on the experience of admission campaigns of previous years, SSAU expects summer 2014 to enrol about 150 foreign students in the university. ...

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... Number nine will put you on the spot. ... Naughty number nine. ... Is that it's one less than ten. You see, nine is the same as ten minus one. ... I mean, eight times nine is 80 minus eight, . And seven times nine is 70 minus seven, . And six times nine is 60 minus six. ... With naughty number nine. ... One times nine is nine, and two times nine is 18. Mean ol' number nine. ... Eight times nine is 72, and nine times nine is 81, . ... With naughty, nasty, mean ol' number nine. ...

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• Three Is A Magic Number
• Springer LINK:A&A-EE: Table of Contents Volume 320 Number 3 (1997)
• Springer LINK:A&A-EE: Table of Contents Volume 331 Number 1 (1998)

... Номер следующего наблюдения устанавливается всегда автоматически, однако существуют ситуации, когда нужно переустановить номер следующего наблюдения (например, предыдущее наблюдение было ошибочным). Это делается командой: NUMBER/NICE [новый_номер] . Например: . NUMBER/NICE 10 установить следующий номер равным 10 . При отсутствии параметра программа сначала покажет старое значение для номера следующего наблюдения, а после этого, запросит новое значение. ...

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• Classification of images
• Input and Output
• EBCCD tutorial background

logN-logS A Measuring Stick for the Universe Vinay Kashyap (CfA) Tuesday , November 9, 2010 log10(N S)-log10(S) cumulative number of sources detectable at a given telescopic sensitivity S = [ergs s-1 cm-2] N = number of sources brighter than S Tuesday , November 9, 2010 simple example uniformly distributed source population all sources have same intrinsic luminosity for telescope sensitivity S, ...

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• Fit a source with a small number of net counts
• A matrix of tweets from #AAS221
• A matrix of tweets from #AAS223

... Content Model: Optional list header (LH), followed by one or more list items (LI) . An ordered list typically is a numbered list of items. ... The numbering style is left to associated style sheets, e.g. whether nested lists contribute to a compound item number, e.g. "3.1.5", or whether numbers are rendered as arabic, upper or lower case roman numerals or using the numbering scheme appropriate to the language context. ... CLASS . ... The CLEAR attribute allows you to move down unconditionally: . ...

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• UNIXhelp Glossary - "I"
• Examples of setting vi options temporarily
• Examples of setting vi options permanently

... Insert date: . Day: . Month: . ... This CGI -script calculates a day of week of the given date, Julian date of Greenwich noon JD and extracts from the database indices of solar activity: Wolf number for the day W , monthly W m and yealy means W y of Wolf number for month and year of the date. The prediction of Wolf number (which was made in 1998 and, hence, lost actuality) is also presented. The database uses solar activity data got from server of National Geophysical Data Center . ...

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• Extended time series of Solar Activity Indices
• Structure of the database files
• Datafile structure

The Telescope:Pointing Data script takes set of pointing error measurements of pointing reference stars across the sky. ... To retry measuring the star, fix the problem (e.g. by adjusting focus, exposure time or offset) and press Continue . ... For each point in the az/alt grid the script will find and slew to a nearby pointing reference star, measure the star, write the pointing error to a data file whose path is displayed, and correct the pointing error. ...

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• Procedure for Part Numbering Convention: Larry Carey, 2005
• TUI:Scripts:Built In Scripts:TSpec:Nod
• TUI:Scripts:Built In Scripts:NICFPS:Data Cube