Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 213
s measured with a sextant. It is described as havingbeen at that time as well defined, in both nucleus and tail, as themoon is on a clear day. The comet is remarkable for its smallperihelion distance, which was only about 540,000 miles; so thatthe comet came within 100,000 miles of the suns… … DONATTS COMET. REMARKABLE COMETS. 201 Bity of heat varies inversely as the square of the distance, the heat to which the comet was subjected must have been about29,000 times as intense as the heat which prevails at the earthssurface: a heat neaily twenty times that required, as shown byexperiments…
Astronomy
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