Philosophical Transactions of the Royal Society - Vol 1 - 1666: Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the WorldVarious
History
Philosophical Transactions of the Royal Society - Vol 1 - 1666: Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World
Various
Science -- Periodicals
They affirm to have observ'd the _Figure_ of this _Eclipse_, and measured
the {296} _Digits_, by casting the _Figure_ through a 5 foot _Telescope_,
on an extended paper, fix't at a certain distance from the Eye-glasse, and
having a round figure; all whose _Diameters_ were divided, by 6
_Concentrick_ Circles, into 12 _Digits_.
The Observations made at _Madrid_ by a Noble Member of the _Royal Society_,
His Excellence the Earle of _Sandwich_, as they were sent to the Right
Honourable, the Lord Vice-Count _Brounker_, are these;
The Eclipse _began_ at _Madrid_ about 5 of the Clock in the morning, at 5
h. 15', the Suns _Altitude_ was 6 deg. 55'.
The _Middle_ of it was at 6 h. 2', the Suns _Altitude_, 15. deg. 5'.
The _End_ was exactly at 7 h. 5'; the Suns _Altitude_, 25. deg. 24'.
The _Duration_, 2h. 4'.
37. Parts of the Suns diameter remained light.
63. Parts of the same were darkened.
The Observations made at _Paris_ by Monsieur _Payen_, assisted by several
_Astronomers_, as they were printed in _French_, and addressed to Monsieur
de _Montmor_, are these;
The _Eclipse_ began there, at 5 h. 44'. 52". _mane_. It ended at 7 h. 43'.
6". So that its _whole Duration_ was 1 h. 58'. 14". The _greatest
Obscuration_ they assign to have been 7. dig. 50. m. but they adde, that it
seem'd to have been greater by 3 minuts; which M. _Payen_ imputes to a
particular motion of _libration_ of the Suns Globe, which entertain'd that
Luminary in the same _Phasis_ for the space of 8. _min._ and some
_seconds_, as if it had been stopped in the midst of its Course; rather
than to a tremulous Motion of the _Atmosphere_, as _Scheiner_ would have
it.
They intimate that they took the time of each _Phasis_ from half _digit_ to
half _digit_, as well by a _Pendulum_, as by the _Altitudes_ of the _Suns
Center_ above the _Horizon_, corrected by the _Verticall Paralaxes_ and
_AEstivall Refractions_, by which they judged, that though the Time by the
_Pendulum_ may be sufficient for _Mechanicall_ Operations, yet 'tis not
exact enough for establishing the _Grounds of true Astronomy_.
They further conceive that the apparent _Diameters_ were almost equal;
seeing that in the _Phasis_ of 6. _Digits_, the _Circumference_ of the
_Moons disk_ passed through the _Center_ of that of the _Sun_, so as that
two Lines drawn through the two _Horns_ of the Sun, made with the _Common
Semi-diameter_ two _Equilateral Triangles_.
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