LOGISTIC ARITHMETIC
\ləd͡ʒˈɪstɪk ɐɹˈɪθmətˌɪk], \lədʒˈɪstɪk ɐɹˈɪθmətˌɪk], \l_ə_dʒ_ˈɪ_s_t_ɪ_k ɐ_ɹ_ˈɪ_θ_m_ə_t_ˌɪ_k]\
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[Gr.] These logarithms are adapted for calculating the fourth term of a proportion in which the terms are hours, minutes, and seconds, or degrees, minutes, and seconds; they are used to shorten the last step in the calculation of a longitude from an observed lunar distance. The term L. arithmetic is sometimes used to denote arithmetical operations performed on numbers sexagesimally divided; hence the name L. logarithms.
By Henry Percy Smith
