Astronomy Explained Upon Sir Isaac Newton's Principles: And made easy to those who have not studied mathematicsFerguson, James
Science
Astronomy Explained Upon Sir Isaac Newton's Principles: And made easy to those who have not studied mathematics
Ferguson, James
Astronomy -- Early works to 1800
283. Here it will probably be asked, why we never observe this
remarkable rising of the Moon but in harvest, since she is in Pisces and
Aries at least twelve times in the year besides; and must then rise with
as little difference of time as in harvest? The answer is plain: for in
winter these Signs rise at noon; and being then only a Quarter of a
Circle distant from the Sun, the Moon in them is in her first Quarter:
but when the Sun is above the Horizon the Moon’s rising is neither
regarded nor perceived. In spring these Signs rise with the Sun because
he is then in them; and as the Moon changeth in them at that time of the
year, she is quite invisible. In summer they rise about mid-night, and
the Sun being then three Signs, or a Quarter of a Circle before them,
the Moon is in them about her third Quarter; when rising so late, and
giving but very little light, her rising passes unobserved. And in
autumn, these Signs being opposite to the Sun, rise when he sets, with
the Moon in opposition, or at the Full, which makes her rising very
conspicuous.
284. At the Equator, the North and South Poles lie in the Horizon; and
therefore the Ecliptic makes the same Angle southward with the Horizon
when Aries rises as it does northward when Libra rises. Consequently, as
the Moon at all the fore-mentioned patches rises and sets nearly at
equal Angles with the Horizon all the year round; and about 48 minutes
later every day or night than on the preceding, there can be no
particular Harvest Moon at the Equator.
Public-domain text, read in full here on John Shaqi.
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