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Aldebaran Eclipsed
Occultation of ALDEBARAN by the MOON.
Mr. URBAN,
AS you now improve Mathematical Knowledge in your
Magazine, I here send an Observation of the Star
Aldebaran eclipsed by the Moon.
FEB 25. last, about V. in the Evening, I perceived
the Star Aldebaran in antecedentia to the Moon, thro'
a four-foot Day Telescope, but could not determine whether
there would happen an Occultation or not, the Star seeming
too much elevated for the Cusp of the illuminated Horn; and
the Sun not being set, the obscured Portion of the Moon's
Disk was altogether invisible; However I continued to
observe, and about 30 after V. the Star instantaneously
disappear'd behind the obscured Disk, as if it had been
actually extinguished. It continued immersed just 16
Minutes, and made a sudden Eruption considerably below the
Tip of the illuminated Horn: But as a Figure will represent
the Appearance more natural, I have added one.
The Place of Observation was Rufforth, in the same
Latitude with York; but about five Miles more to the
West, according to Measure.
The first Observation of this Star, that I know of, being
eclips'd by the Moon, was in the Year 509 of Christ; but no
doubt there were many antecedents to it. It has many Names;
as the Lucida, Palilitium, Oculus Tauri, Aldebaran,
and in the Hebrew, Kesil; hence Kesilim for
the Hyades. Such an Immersion as this preceded the
Overthrow of the Babylonian Empire by the
Medes; for that Nation being eminent Astronomers, the
Prophet Isaiah gave them a Sign fore-running their
Destruction, after their own Method, and suited to their
favourite Science, almost 300 Years before it happenend;
which at that time was more than all the Mathematicians of
the Universe could do. See Isaiah xiii. 10. For
the Stars of Heaven and the Kesilim thereof shall be
hid, &c. The rest of the Verse is a Prediction of a
Solar and Lunar Eclipse happening much about the same Time;
all which Occurrences have not, since that Period, happened
so near again, till the present Year, that I know of.
Yours, G. S.
P.S. These and like Observations are of great Use, not only
to determine the Longitude of Places, but to perfect the
Theory of the Moon.
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