Page:Philosophical Transactions - Volume 095.djvu/151

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137
of the variable Star in Sobieski's Shield.

attended to in the computation, and then the mean of the whole will be 33+ and 29— days: thus it appears that the time of the decrease is longer than that of the increase, and consequently that the places of the full and the least brightness are not situated at the distance of half the circumference from each other: the like circumstance will be found to be the case with most, if not all, of the variable stars. The next particulars to be reviewed are the durations of its brightness without any perceptible change, while at its maximum and minimum. These determinations require a tolerable succession of observations; where therefore that is not the case, they are omitted.

Table VI.

Duration of Brightness at its Maximum. Duration of Brightness at its Minimum.
Days. Magni-
tudes.
Days. Magni-
tudes.
1796. 1796.
September 17 9 - 5 September 3 7 - 6
November 13 8 - 5— October 22 8 - 6
1797. 1797.
October 15 32 - 6.5 July 10 24 - 5.6
1798. September 15 18: - 6+
July 29 6 - 5+ November 6 6 - 6
October 25 10 - 5.6 1798
December 5 16 or more 5.6 July 10 12 - 6
1799. September 15 9 - 9
June 1 16:: - 6.5 November 10 8 - 6+
August 7 8 - 5 1799
October 11 8 - 5+ July 4 9 - 7
1801. September 16 10 - 6
September 24 15:: - 5 November 5 16: - 6.7
1801
October 16 9 - 6.5