Excerpt from Heliographic Positions of Sun-Spots Observed at Hamilton College From 1860 to 1870

There were also preserved the 312 sheets of reductions, representing the logarithmic work involved in deriving the heliographic latitude and longitude. These also show what reduction quantities, calculated from the adopted ele ments of the sun's rotation, were used each day, but they do not state whence the elements were derived. The author doubtless computed tables for his own use in the work, but they have not been found. Investigation has shown that he employed for the longitude of the node and the inclination the values derived by Carrington from his long series of observations, and recommended by him for future adoption, viz., N=73� 40' for 1850, I=7� Dr. Peters employed a different period and a different epoch from those of Carrington, and reckoned his longitudes in the oppo site direction.

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