On the variability of personal equation in transit observations

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1869
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Abstract
l'HE personal equation of an ohserver is the interval of time which habitually intervenes between the actual aud the observed transit of a star over a given thread of the transit instrument.This may be termed the absolute personal equation.The relative personal equation of two observers is the interval of time by which one habitually observes a transit either earlier or later than the other; or, it is the difference between their absolute equations.It is well known that personal equation is one of the most uncertain elements in chronographic determinat.ions of longitude.It has been the cust.om, at least in this country, in observations for longitude, to assume that the value of'this function of the time remains unchanged during the entire series, even though the comparisons for the determination of this element were delayed for several weeks.Now if the personal equation of the observers is not a constant quantity, if it can be shown that from any cause it varies from week to week; from day to day, and even fi'om hour to hour, between limits nearly as large as the usnal value of the function itself, it will be evident that some uncertainty yet remains in the accepted values of longitude, especially since in almost every instance, the observations for longitude and personal equation have been separated by a considerable interval of time.The investigation of the variability of personal equation is, therefore, not an idle inq niry.
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openalex_W2321453195 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors William A. Rogers
Journal american journal of science
Year 1869
DOI
10.2475/ajs.s2-47.141.297
URL
https://ajsonline.org/article/62271.pdf
Keywords Keywords not found

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