For common purposes we may without sensible error suppose the earth's motion equable and neglect the corrections, and then the rule for the parallax of right ascension will be this: Sine lat. : rad. : : cotang. A : cotang. C, or rad : sine lat. : : tang. A : tang. C; then long. star \mp C = long. of λ. Cosine C : cosine A : : semi transverse axis : z. And cosine decl. cosine (ʘ - λ) :: z : x = parallax of right ascension.
James BradleyRelated topics
axis common error neglect rad right rule suppose tang semi correctionsRelated quotes
Labour, upon whichever of those operations it be bestowed, is productive, because it concurs in the creation of a product. Thus the labour of the philosopher, whether experimental or literary, is productive; the labour of the adventurer or master-manufacturer is productive, although he perform no actual manual work; the labour of every operative workman is productive, from the common day-labourer in agriculture, to the pilot that governs the motion of a ship.
Jean-Baptiste Say
The day dawns; the morning star is bright upon the horizon! The iron gate of our prison stands half open. One gallant rush from the North will fling it wide open, while four millions of our brothers and sisters shall march out into liberty. The chance is now given you to end in a day the bondage of centuries, and to rise in one bound from social degradation to the place of common equality with all other varieties of men.
Frederick Douglass
For although it is certainly true that quantitative measurements are of great importance, it is a grave error to suppose that the whole of experimental physics can be brought under this heading. We can start measuring only when we know what to measure: qualitative observation has to precede quantitative measurement, and by making experimental arrangements for quantitative measurements we may even eliminate the possibility of new phenomena appearing.
Hendrik Casimir
I believe that the main lesson which our generation has learnt is that we must find a new limit for the activities of government, a limit which leaves ample scope for sensible experimentation but which secures the freedom of the individual as the mainspring of all social and political activity. The whole purpose of these lectures has been to suggest that we can find such a limit if we are willing to revive and develop the ancient ideal of the Rule of Law.
Friedrich Hayek
It is therefore not unreasonable to suppose that some portion of the neglect of science in England, may be attributed to the system of education we pursue. A young man passes from our public schools to the universities, ignorant of almost every branch of useful knowledge; and at these latter establishments ... classical and mathematical pursuits are nearly the sole objects proposed to the student's ambition.
Charles Babbage