“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 Bradley

Miscellaneous Works and Correspondence (1832), Demonstration of the Rules relating to the Apparent Motion of the Fixed Stars upon account of the Motion of Light.

Adopted from Wikiquote. Last update June 3, 2021. History

Help us to complete the source, original and additional information

Do you have more details about the quote "For common purposes we may without sensible error suppose the earth's motion equable and neglect the corrections, and t…" by James Bradley?

James Bradley11

English astronomer; Astronomer Royal 1693–1762

Related quotes

“Consider an event, for example the outburst if a nova… Suppose this event is observed from two stars in line with the nova, and suppose further that the two stars are moving uniformly with respect to each other in this line. Let the epoch at which these stars passed by each other be taken as the zero of time measurement, and let an observer A on one of the stars estimate the distance and epoch of the nova outburst to be x units of length and t units of time, respectively. Suppose the other star is moving toward the nova with velocity v relative to A. Let an observer B on the star estimate the distance and epoch of the nova outburst to be x' units of length and t' units of time, respectively. Then the Lorentz formulae, relating x' to t', arex' = \frac {x-vt}{\sqrt{1-\frac{v^2}{c^2}}}; \qquad t' = \frac {t-\frac{vx}{c^2}}{\sqrt{1-\frac{v^2}{c^2}}}
These formulae are… quite general, applying to any event in line with two uniformly moving observers. If we let c become infinite then the ratio of v to c tends to zero and the formulae becomex' = x - vt; \qquad t' = t.”

Gerald James Whitrow (1912–2000) British mathematician

p, 125
The Structure of the Universe: An Introduction to Cosmology (1949)

“As for the moral status of majority rule, it must be pointed out that it allows for A and B to band together to rip off C, C and A in turn joining to rip off B, and then B and C conspiring against A, and so on.”

Hans-Hermann Hoppe book Democracy: The God That Failed

Democracy - The God That Failed: The Economics and Politics of Monarchy, Democracy, and Natural Order (Transaction: 2001): 104.
Democracy: The God That Failed (2001)

“… so as long as you do The Right Thing and forget how you would do it in C, you should be able to get a good grip on this.”

Erik Naggum (1965–2009) Norwegian computer programmer

Re: Allegro CL foreign function interface http://groups.google.com/group/comp.lang.lisp/msg/2ec281a4f469bb35 (Usenet article). <br class="br">Usenet articles

“Hitherto we have considered the apparent motion of the star about its true place, as made only in a plane parallel to the ecliptic, in which case it appears to describe a circle in that plane; but since, when we judge of the place and motion of a star, we conceive it to be in the surface of a sphere, whose centre is our eye, 'twill be necessary to reduce the motion in that plane to what it would really appear on the surface of such a sphere, or (which will be equivalent) to what it would appear on a plane touching such a sphere in the star's true place. Now in the present case, where we conceive the eye at an indefinite distance, this will be done by letting fall perpendiculars from each point of the circle on such a plane, which from the nature of the orthographic projection will form an ellipsis, whose greater axis will be equal to the diameter of that circle, and the lesser axis to the greater as the sine of the star's latitude to the radius, for this latter plane being perpendicular to a line drawn from the centre of the sphere through the star's true place, which line is inclined to the ecliptic in an angle equal to the star's latitude; the touching plane will be inclined to the plane of the ecliptic in an angle equal to the complement of the latitude. But it is a known proposition in the orthographic projection of the sphere, that any circle inclined to the plane of the projection, to which lines drawn from the eye, supposed at an infinite distance, are at right angles, is projected into an ellipsis, having its longer axis equal to its diameter, and its shorter to twice the cosine of the inclination to the plane of the projection, half the longer axis or diameter being the radius.
Such an ellipse will be formed in our present case…”

James Bradley (1693–1762) English astronomer; Astronomer Royal

Miscellaneous Works and Correspondence (1832), Demonstration of the Rules relating to the Apparent Motion of the Fixed Stars upon account of the Motion of Light.

“The Insubordinate Ritual:
The Candidate hands a previously prepared necklace to the person who will be the Recipient of the insubordination.
The Recipient places the necklace about his or her neck and kneeling before the candidate asks:
R: Will you test me as my Fool, so that all may understand?
C: I will.
R: Will you test me as my Jester, if none else will criticize?
C: I will.
R: Will you test me as my Chaplain, that no fault lie unremedied?
C: I will.
R: Will you test me as my Confessor, lest I neglect my own progress?
C: I will.
R: Will you test me as my Inquisitor. if I exceed my authority?
C: I will.
R: Then how ill you be known?
C: As your ______ ______
R: Then take this necklace my ______ ______, to remind us of your duties.”

Peter J. Carroll (1953) British occultist

The Recipient then give the necklace to the Candidate. The Ritual is concluded by a brief barrage of insulting noises directed by all at the recipient.
p 212-213
Liber Kaos (1992)