Page:Mars - Lowell.djvu/284

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214
APPENDIX
Mars 3.1 miles a second.
Jupiter 37.  " " " (mean value).
Saturn 22.  " " " " "
Uranus 13.  " " " " "
Neptune 14.  " " " " "
Sun 382.  " " "

While the probable maximum speed of the molecules of some of the common gases at 0° Cent. are as follows:—

Hydrogen 7.4 miles a second.
Water vapor 2.5 " " "
Nitrogen 2.0 " " "
Oxygen 1.8 " " "
Carbonic dioxide 1.6 " " "




Note II

The change in the apparent size of the equatorial diameter as compared with the polar one as the phase increased, suggesting the unconscious measurement of a twilight upon the planet, becomes still more striking when, in addition to the October-November measures mentioned in the text, the measures from July to October are considered in connection with them. Tabulated chronologically, the whole are as follows:—


MEANS
Polar Diameters
Cor. for
ref. irr.
tilt and
phase
Irr. 0".10
Prob.
error
Angle
of
phase
Cor. for
ref. irr.
tilt and
phase
Irr. 0".15
July (6 to 22 inc.) 9.976 0".13 9.933
Aug. (11 to 21 inc.) 9.362 0".04 9.325
Sept. (20 to Oct. 5 inc.) 9.401 0".012 9.355
Oct. (12 & 24 to 30 inc.) 9.375 0".028 9.336
Oct. (15 to 23 inc.) 9.379 0".011 2°.5 9.339
Oct. (12 & 24 to 30 inc.) 9.375 0".028 9.336
Nov. (2 to 21 inc.) 9.390 0".012 9.350