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
+------+-----------+--------+---------+
| | Signs | Rising | Setting |
| | | Diff. | Diff. |
| Days | +--------+---------+
| | Degrees | H. M. | H. M. |
+------+-----------+--------+---------+
| 1 | ♋ 13 | 1 5 | 0 50 |
| 2 | 26 | 1 10 | 0 43 |
| 3 | ♌ 10 | 1 14 | 0 37 |
| 4 | 23 | 1 17 | 0 32 |
| 5 | ♍ 6 | 1 16 | 0 28 |
| 6 | 19 | 1 15 | 0 24 |
| 7 | ♎ 2 | 1 15 | 0 20 |
| 8 | 15 | 1 15 | 0 18 |
| 9 | 28 | 1 15 | 0 17 |
| 10 | ♏ 12 | 1 15 | 0 22 |
| 11 | 25 | 1 14 | 0 30 |
| 12 | ♐ 8 | 1 13 | 0 39 |
| 13 | 21 | 1 10 | 0 47 |
| 14 | ♑ 4 | 1 4 | 0 56 |
| 15 | 17 | 0 46 | 1 5 |
| 16 | ♒ 1 | 0 40 | 1 8 |
| 17 | 14 | 0 35 | 1 12 |
| 18 | 27 | 0 30 | 1 15 |
| 19 | ♓ 10 | 0 25 | 1 16 |
| 20 | 23 | 0 20 | 1 17 |
| 21 | ♈ 7 | 0 17 | 1 16 |
| 22 | 20 | 0 17 | 1 15 |
| 23 | ♉ 3 | 0 20 | 1 15 |
| 24 | 16 | 0 24 | 1 15 |
| 25 | 29 | 0 30 | 1 14 |
| 26 | ♊ 13 | 0 40 | 1 13 |
| 27 | 26 | 0 50 | 1 7 |
| 28 | ♋ 9 | 1 0 | 1 58 |
+------+-----------+--------+---------+
[Sidenote: Quantity of this Angle at London.]
277. On the Parallel of _London_, as much of the Ecliptic rises about
Pisces and Aries in two hours as the Moon goes through in six days: and
therefore whilst the Moon is in these Signs, she differs but two hours
in rising for six days together; that is, 20 minutes later every day or
night than on the preceding. But in fourteen days afterwards, the Moon
comes to Virgo and Libra; which are the opposite Signs to Pisces and
Aries; and then she differs almost four times as much in rising; namely,
one hour and about fifteen minutes later every day or night than the
former, whilst she is in these Signs; for by § 275 their rising Angle is
at least four times as great as that of Pisces and Aries. The annexed
Table shews the daily mean difference of the Moon’s rising and setting
on the Parallel of _London_, for 28 days; in which time the Moon
finishes her period round the Ecliptic, and gets 9 degrees into the same
Sign from the beginning of which she set out. So it appears by the
Table, that while the Moon is in ♍ and ♎ she rises an hour and a quarter
later every day than the former; and differs only 24, 20, 18 or 17
minutes in setting. But, when she comes to ♓ and ♈, she is only 20 or 17
minutes later of rising; and an hour and a quarter later in setting.
Public-domain text, read in full here on John Shaqi.
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