NEW 
OF THE PLANET MEECURT. 
461 
TABLE XI. 
FOR IRKADIATION TO TUliEE DUTEUENT EXTENTS. 
COURBC 
43 
between Drawings and Micrometiic Measures 
Th<> nl)Ove nre 
the points in which the two sets of measures, those by the micrometer and tho<^ from 
•awinffs, ajrree. We now come to others, more interesting poinU, those m 
the d 
\ 
rvhich they disagree, 
kinds of measures are 
To understand them we must first consid 
d 
from 
of 
The measures of the drawings differ e 
micrometer in that the drawings are concerned solely 
1 what the two 
ontially 
pparent phase, while the micrometric measures are not concerned with the phai?e 
such at i 
from the 
but solely 
of the apparent equatorial and polar d 
of which the phase follows as a resulting corollary 
We 
continuance that not only 
drawin£?s directly interested in the d 
of the 
tion to 
phase, but that near dichotomy the drawings have a comparativoly c.-usy 
determine: simply the question of whether the terminator be a straigl 
i 
