Thus the differences in the wave-lengths of presumably the same lines as measured by different Arctic observers may be only partly due to unfavourable observational conditions.
With the development of observational astronomy the sidereal universe was arbitrarily divided into areas characterized by special assemblages of stars; these assemblages were named asterisms by Ptolemy, who termed the brightest stars "of the fi rst magnitude," and the progressively fainter Stars.
This observational method Cousin regards as that of the 18th century, - the method which Descartes began and abandoned, and which Locke and Condillac applied, though imperfectly, and which Reid and Kant used with more success, yet not completely.
The observational method applied to consciousness gives us the science of psychology.
All along the base of the highlands, from Khojent to Vyernyi, earthquakes are frequent; 3 but their effects lie beyond the scope of our observational methods.
He was originally a watchmaker, but retired from business about the age of thirty and devoted himself to experimental and observational science.
Before considering observational data, it is expedient to mention various sources of uncertainty.
Owing to observational difficulties, the exact measure of success attained is a little difficult to gauge, but it seems fairly certain that raindrops usually carry a charge.
In the last quarter of the 19th century spectroscopy and photography together worked a revolution in observational astronomy, and in both branches Huggins acted as pioneer.
This motion is evidently not due to parallax, for, in this case, the maximum range should be between the June and December positions; neither was it due to observational errors.
Equations of this form have received a striking observational verification in so far as they predict a tail or root towards which the lines ultimately tend when s is increased indefinitely.
It is an experimental or observational science, founded on primary or immediate judgments (in his phraseology, perceptions), of relation between facts of intuition; its conclusions are hypothetical only in so far as they do not imply the existence at the moment of corresponding real experience; and its propositions have no exact truth.
In the southern hemisphere there is comparatively little inhabited land in high latitudes and observational data are few; thus little is known as to how the frequency varies with latitude and longitude.
Now that psychology, or the observational and experimental study of mind, may be said to have been definitively included among the positive sciences, there is not even the apparent ground which once existed for such an idea.
Observational astronomy, meanwhile, was advancing to some extent independently.
The phase angle, however, varies so much as to suggest that the term mainly represents local causes or observational uncertainties.
It became fairly certain, however, that theory had outrun observational work, and that the latter must again receive renewed attention.