The computations for the
observations have been exceptionally heavy, from the circumstance that
the Sun was very low (86 deg. 14' Z.D. at the last observation) and that
it has therefore been necessary to compute the refraction with great
accuracy, involving the calculation of the zenith distance for every
observation. And besides this, eighty-six separate computations of the
tabular R.A. and N.P.D. of cusps have been required.--Amongst other
interesting spectroscopic observations of the Sun, a remarkable
spectrum of a sun-spot shewing 17 strong black lines or bands, each as
broad as b_1, in the solar spectrum, was observed on 1880, Nov. 27 and
29. These bands to which there is nothing corresponding in the Solar
Spectrum (except some very faint lines) have also been subsequently
remarked in the spectrum of several spots.--The Police Ship 'Royalist'
(which was injured by a collision in 1879 and had been laid up in
dock) has not been again moored in the river, and the series of
observations of the temperature of the Thames is thus terminated.
--Part of the month of January 1881 was, as regards cold,
especially severe. The mean temperature of the period January 12 to
26 (15 days) was only 24.
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