The Philosophical magazine; a journal of theoretical, experimental and applied physics . nd Series. On the Beha-viour of Sun-spots with regard to Increase and Diminution. ByWarreuDe la Rue, , , Balfour Stewart, , ,and Benjamin Loewy, Esq. One of the authors of this paper having been led, from a preli-minary investigation, to suspect that the behaviour of sun-spots withrespect to increase and diminution refers to some extraneous influ-ence, they resolved to investigate the behaviour in this respect of thespots observed by Carrington, in addition to the Kew photograms upto t
The Philosophical magazine; a journal of theoretical, experimental and applied physics . nd Series. On the Beha-viour of Sun-spots with regard to Increase and Diminution. ByWarreuDe la Rue, , , Balfour Stewart, , ,and Benjamin Loewy, Esq. One of the authors of this paper having been led, from a preli-minary investigation, to suspect that the behaviour of sun-spots withrespect to increase and diminution refers to some extraneous influ-ence, they resolved to investigate the behaviour in this respect of thespots observed by Carrington, in addition to the Kew photograms upto the present date. The authors have thus examined materials embracing a period often years, and in this paper state the result. The nature of their examination is thus described :— If we imagine great circles of ecliptical longitude to be drawn fromthe suns centre, every point of the suns surface as it moves roundby rotation will of course pass successively through each of thosegreat circles, and every one of the planets will do the same as theymove round by their own proper And if we imagine the plane of the paper to denote the planeof the echptic, and project upon this plane each body of our system,we shall have a scheme similar to the above, in which ADB, the innercircle, may represent the sun himself, the next circle, let us say theorbit of Venus, the next that of our earth, while the outer may denotethe orbit of Jupiter. To an observer looking down upon our systemfrom the north, all motions will be in the direction of the arrow-heads,that is to say, in a direction contrary to that of the hands of a watch,or loft-handed, while ecliptical circles of longitude will be represented Royal Society. 391 by the various railii jn-occ^ding from the centre C, the angular dif-ference between the two radii denoting the angular difference betweenthe two correspoudin glongitudes. If the observer be stationed atthe earth, all points of the solar surface will advance by rotationfr
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