The description and use of an universal and perpetual mathematical instrument ... shewing the most expeditious and exact method of solving all practical questions in arithmetick, trigonometry, navigation, dyalling, astronomy, &c. ... / by Benjamin Scott.

  • Scott, Benjamin, -1755.
Date:
1733
Catalogue details

Licence: Public Domain Mark

Credit: The description and use of an universal and perpetual mathematical instrument ... shewing the most expeditious and exact method of solving all practical questions in arithmetick, trigonometry, navigation, dyalling, astronomy, &c. ... / by Benjamin Scott. Source: Wellcome Collection.

    29/144 page 11
    C in] Longitude of a Star, is its Place in the Zo- diack, reckoning from the Beginning of Aries. In Geography it 1s the Diftance of your Habita- tion, either Eaft or Welt, from any other Me- ridian, reckoned in Degrees upon the Equator. ‘ Leap-Year, the fame with Bifextile, which ee. Leo, the Lyon, the fifth Sign in the Zodiack, thus characterized St, into which the Sun comes the 12th Day of July, whence in the Latitude of London then begins to be perfect Night. Libra, the Balance, the feventh Sign in the Zodiack, characterized thus &, unto which the Sun comes the 12th Day of September, making . 2 the autumnal Equinox. Mars, the Name of one of the Planets, which moves round the Sun in an Orb between that of the Earth and Yupiter ; he performs his Re- volution in 1 Year 321 Days 23 Hours and 27 Minutes ; his mean diurnal Motion is 31° 27” ; his Orbit makes an Angle with the Ecliptick of 1° 52’, and he is 15 Times lefs than our Earth. Mercuyy, the Name of one of the Planets, whofe Orb is next unto the Sun, for that Rea- fon he is feldom feen; he is never more than 29° from the Sun ; he performs his Revolution in 87 Days 23 Hours 16 Seconds: ‘The Inclina- tion of his Orbit with the Ecliptick is 6° sai an
    digitised image 1
    digitised image 2
    digitised image 3