lyes nearest the
terminating Rayes GP, and EP, and those darker that lye nearest to GS, and
ES: when therefore the Moon appears quite dark in the middle of the
Eclipse, she must be below S, that is, between S and F; when she appears
lighter near the middle of the Eclipse, she must pass some where between RQ
and S; and when she is alike light through the whole Eclypse, she must pass
between RQ, and P.
* * * * *
Observ. LIX. _Of multitudes of small _Stars_ discoverable by the
_Telescope_._
Having, in the last Observation, premis'd some particulars observable in
the _medium_, through which we must look upon _Coelestial_ Objects, I shall
here add one Observation of the Bodies themselves; and for a _specimen_ I
have made choice of the _Pleiades_, or seven Stars, commonly so called
(though in our time and Climate there appear no more then six to the naked
eye) and this I did the rather, because the deservedly famous _Galileo_,
having publisht a Picture of this _Asterisme_, was able, it seems, with his
Glass to discover no more then thirty six, whereas with a pretty good
twelve foot _Telescope_, by which I drew this 38 _Iconism_, I could very
plainly discover seventy eight, placed in the order they are ranged in the
Figure, and of as many differing Magnitudes as the _Asterisks_, wherewith
they are Marked, do specifie; there being no less then fourteen several
Magnitudes of those Stars, which are compris'd within the draught, the
biggest whereof is not accounted greater then one of the third Magnitude;
and indeed that account is much too big, if it be compared with other Stars
of the third Magnitude, especially by the help of a _Telescope_; for then
by it may be perceiv'd, that its splendor, to the naked eye, may be
somewhat augmented by the three little Stars immediately above it, which
are near adjoyning to it. The _Telescope_ also discovers a great variety,
even in the bigness of those, commonly reckon'd, of the first, second,
third, fourth, fifth, and sixth Magnitude; so that should they be
distinguish'd thereby, those six Magnitudes would, at least, afford no less
then thrice that number of Magnitudes, plainly enough distinguishable by
their Magnitude, and brightness; so that a good twelve foot Glass would
afford us no less then twenty five several Magnitudes. Nor are these all,
but a longer Glass does yet further, both more nicely distinguish the
Magnitudes of those already noted, an
|