[630] _In shining frost the
Northern
Chariot rides.
Camoes - Lusiades
_--This is the tenth sphere, the
_Primum Mobile_ of the ancient system. To account for the appearances of
the heavens, the Peripatetics ascribed a double motion to it. While its
influence drew the other orbs from east to west, they supposed it had a
motion of its own from west to east. To effect this, the ponderous
weight and interposition of the ninth sphere, or crystalline heaven, was
necessary. The ancient astronomers observed that the stars shifted their
places. This they called the motion of the crystalline heaven, expressed
by our poet at the rate of one pace during two hundred solar years. The
famous Arab astronomer, Abulhasan, in his Meadows of Gold, calculates
the revolution of this sphere to consist of 49,000 of our years. But
modern discoveries have not only corrected the calculation,{*} but have
also ascertained the reason of the apparent motion of the fixed stars.
The earth is not a perfect sphere; the quantity of matter is greater at
the equator; hence the earth turns on her axis in a rocking motion,
revolving round the axis of the ecliptic, which is called the procession
of the equinoxes, and makes the stars seem to shift their places at
about the rate of a degree in 72 years; according to which all the stars
seem to perform one revolution in the space of 25,920 years, after which
they return exactly to the same situation as at the beginning of this
period. However imperfect in their calculations, the Chaldean
astronomers perceived that the motions of the heavens composed one great
revolution. This they called the _annus magnus_, which those who did not
understand them mistook for a restoration of all things to their first
originals.
{*} However deficient the astronomy of Abulhasan may be, it is nothing
to the calculation of his prophet Mohammed, who tells his disciples,
that the stars were each about the bigness of a house, and hung from the
sky on chains of gold.
[629] _And binds the starry sphere. _--This was called the firmament, or
eighth heaven. Saturn, Jupiter, Mars, Apollo, Venus, Mercury, and Diana,
were the planets which gave name to, and whose orbits composed, the
other spheres or heavens.
[630] _In shining frost the Northern Chariot rides. _--Commonly called
Charles' Wain. Andromeda was the daughter of Cepheus, king of Ethiopia,
and of Cassiope. Cassiope boasted that she and her daughter were more
beautiful than Juno and the Nereids. Andromeda, to appease the goddess,
was, at her father's command, chained to a rock to be devoured by a sea
monster, but was saved by Perseus, who obtained of Jupiter that all the
family should be placed among the stars. Orion was a hunter, who, for an
attempt on Diana, was stung to death by a serpent. The star of his name
portends tempests. The Dogs; fable gives this honour to those of
different hunters. The faithful dog of Erigone, however, that died mad
with grief for the death of his mistress, has the best title to preside
over the dog-days. The Swan; whose form Jupiter borrowed to enjoy Leda.
The Hare, when pursued by Orion, was saved by Mercury, and placed in
heaven, to signify that Mercury presides over melancholy dispositions.
The Lyre, with which Orpheus charmed Pluto. The Dragon which guarded the
golden apples of the Hesperides, and the ship Argo complete the number
of the constellations mentioned by Camoens. If our author has blended
the appearances of heaven with those of the painted artificial sphere,
it is in the manner of the classics. Ovid, in particular, thus describes
the heavens, in the second book of his Metamorphoses.
[631] _Such are their laws impress'd by God's dread will.
_Primum Mobile_ of the ancient system. To account for the appearances of
the heavens, the Peripatetics ascribed a double motion to it. While its
influence drew the other orbs from east to west, they supposed it had a
motion of its own from west to east. To effect this, the ponderous
weight and interposition of the ninth sphere, or crystalline heaven, was
necessary. The ancient astronomers observed that the stars shifted their
places. This they called the motion of the crystalline heaven, expressed
by our poet at the rate of one pace during two hundred solar years. The
famous Arab astronomer, Abulhasan, in his Meadows of Gold, calculates
the revolution of this sphere to consist of 49,000 of our years. But
modern discoveries have not only corrected the calculation,{*} but have
also ascertained the reason of the apparent motion of the fixed stars.
The earth is not a perfect sphere; the quantity of matter is greater at
the equator; hence the earth turns on her axis in a rocking motion,
revolving round the axis of the ecliptic, which is called the procession
of the equinoxes, and makes the stars seem to shift their places at
about the rate of a degree in 72 years; according to which all the stars
seem to perform one revolution in the space of 25,920 years, after which
they return exactly to the same situation as at the beginning of this
period. However imperfect in their calculations, the Chaldean
astronomers perceived that the motions of the heavens composed one great
revolution. This they called the _annus magnus_, which those who did not
understand them mistook for a restoration of all things to their first
originals.
{*} However deficient the astronomy of Abulhasan may be, it is nothing
to the calculation of his prophet Mohammed, who tells his disciples,
that the stars were each about the bigness of a house, and hung from the
sky on chains of gold.
[629] _And binds the starry sphere. _--This was called the firmament, or
eighth heaven. Saturn, Jupiter, Mars, Apollo, Venus, Mercury, and Diana,
were the planets which gave name to, and whose orbits composed, the
other spheres or heavens.
[630] _In shining frost the Northern Chariot rides. _--Commonly called
Charles' Wain. Andromeda was the daughter of Cepheus, king of Ethiopia,
and of Cassiope. Cassiope boasted that she and her daughter were more
beautiful than Juno and the Nereids. Andromeda, to appease the goddess,
was, at her father's command, chained to a rock to be devoured by a sea
monster, but was saved by Perseus, who obtained of Jupiter that all the
family should be placed among the stars. Orion was a hunter, who, for an
attempt on Diana, was stung to death by a serpent. The star of his name
portends tempests. The Dogs; fable gives this honour to those of
different hunters. The faithful dog of Erigone, however, that died mad
with grief for the death of his mistress, has the best title to preside
over the dog-days. The Swan; whose form Jupiter borrowed to enjoy Leda.
The Hare, when pursued by Orion, was saved by Mercury, and placed in
heaven, to signify that Mercury presides over melancholy dispositions.
The Lyre, with which Orpheus charmed Pluto. The Dragon which guarded the
golden apples of the Hesperides, and the ship Argo complete the number
of the constellations mentioned by Camoens. If our author has blended
the appearances of heaven with those of the painted artificial sphere,
it is in the manner of the classics. Ovid, in particular, thus describes
the heavens, in the second book of his Metamorphoses.
[631] _Such are their laws impress'd by God's dread will.
