Mr. Schroeter's Observations 
360 
than an arc of 2 0 34/ of the circumference of the moon, and if 
it be hence demonstrable that its greatest dilatation does barely 
amount to 5 0 8', and the perpendicular height of that part of 
the lower more condensed stratum of its atmosphere, which 
is capable of reflecting the solar rays, and of producing some 
other, perhaps more remarkable, obscurities in the stars seen 
through it, does not exceed 5000 Paris feet, and hence cannot 
reach above one second of a degree above the limb of the 
moon ; we need not wonder that so small a magnitude, which 
loses itself in the inequalities of the limb, many parts of which 
are known to be considerably mountainous, should not be- 
come sensible, especially at the approach of a body of so 
large a diameter as Jupiter, and when so small a magnifying 
power is applied. And thus may I, with confidence, assert a 
perfect coincidence between this and my many other ob- 
servations. 
The appearance, fig. 5, when Jupiter, at the emersion, the 
objects being particularly sharp and distinct, came forth from 
behind the moon, which now covered no more than one- 
quarter of its diameter, was truly splendid and satisfactory ; 
and I must here particularly mention the circumstance, that 
the part of the moon's dark hemisphere, between its bright 
terminating edge m n, and its outward limb, bordering upon 
the emerging planet, op, was particularly opake, and hence 
produced a very striking effect. 
I omit entering here upon any farther considerations, and 
shall conclude with observing that, after the occupation was 
completely ended, the luminous spot / had at ia h T so far ad- 
vanced in its parallel d e, as to have reached to within or 
at most of its whole length, of the western limb. And that 
