The Harvard photometric measures make it nearly one magnitude brighter than the zero magnitude, about two magnitudes brighter than Aldebaran, and about half the brightness of Sirius.
According to the Harvard photometric measures its brightest star is Fl.
For those of first magnitude and fainter I have only given those for which all the best observers in ancient and modern times agree, and which have been confirmed by modern photometric measures.
Modern photometric measures confirm the estimates of Al-Sufi and Argelander.
Photometric record showing variation of intensity of light from morning to evening.
The surface above and below the equatorial band is set off by parallels to match the photometric scale, making nine bands or value zones in all, of which the equator is fifth, the black pole being 0 and the white pole 10.
Lest the graying of red should have disturbed its value, it is again tested on the photometric scale, and reads 4.
Pole-star is very nearly invariable, we may say that the zero-point of the photometric scale is chosen in such a manner that for the Pole-star m = 2.
Footnote 1059: Pickering failed to obtain any photometric evidence of their variability.
Publication of Potsdam Photometric Durchmusterung, part i.
A photometric zone, 20° wide, has for some time been in course of observation at Potsdam by MM.
There is no certainty as to the relative times of exposure needed to get images of stars representative of successive photometric ranks.
The satellite-theory has derived unlooked-for support from photometric inquiries.
After an orbit has been determined from the photometricdata of the light curve, the addition of spectroscopic data often permits the calculation of the masses, dimensions and densities in terms of the sun.
Frank Bailey has furnished particulars of photometric tests which he has made on new and old street lamps in the city of London.
Given the photometric polar curves or illuminating-power curves of each arc taken outside the shade or globe, we can therefore draw a curve representing the resultant illumination on the horizontal surface.
The values obtained by the use of Allard's formulae, which were largely used before the necessity for actual photometric measurements came to be appreciated, are considerably in excess of the true intensities.
It was found that the intensities determined by photometric measurement were considerably less than the values given by the theoretical calculations formerly employed.
The process of delineating the photometric or polar curve of intensity for an arc lamp is somewhat tedious, but the curve has the advantage of showing exactly the distribution of light in different directions.
It should, however, be pointed out that photometric measurements alone can be relied upon to give accurate values for lighthouse intensities.
For some years past star-magnitudes have been determined very accurately by means of careful photometric comparisons.
The fading of the moon's light, due to its entrance into the penumbra, is scarcely noticeable without direct photometric determination until near the beginning of the total phase.
There being no limit to the extent of the scale, what would be the stellar magnitude of the sun as we see it when expressed this way on the photometric scale?
As we proceed to place the subject of photometric measures of star light on this precise basis we find the problem to be a complex one.
This fact simply emphasizes the lack of mathematical precision in photometric measurements of star light.
A series of careful photometric experiments carried out by the municipal authorities with the Jablochkoff lights, above referred to, showed each naked light to possess a maximum of 300 candles of intensity.
For instance, one light which had a certain photometric candle valve would yield when divided into two an aggregate amount of light considerably less than the one; and if divided into three still less, and so on.
Photometric catalogues, accordingly, form an indispensable part of stellar statistics; and their construction has been zealously prosecuted.
The development of the method has been greatly assisted by photography, while the application of photometric measurements has been a powerful auxiliary in the work.
Derived Units and Measure of Energy: Importance of erg as unit--Calorimeter usual means of determination--Photometric units.
For instance, radiation being nothing but a flux of energy, we could, in order to establish photometric units, divide the normal spectrum into bands of a given width, and measure the power of each for the unit of radiating surface.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "photometric" in a variety of sentences. We hope that you will now be able to make sentences using this word.
