## A Compleat System of Astronomy ... |

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### Common terms and phrases

Aldebaran angled spheric Triangle Anno Aphelion apparent Arch Argument of Latitude Astronomical Axis Azimuth Capricorn Center Colure Compl Complement Constellation Cusp Declination North Degr Degrees 32 Minutes Difference Diurnal Motion Dominical Letter draw Earth Ecliptic equal Equation Equinoctial Example fame fetting find the Angle fixed Stars given Horizon Horizontal Parallax Hour-lines Hours Line of Chords Logistical Logarithm London Longitude mean Anomaly Mid-heaven Moon Node Nonagesime Degree Noon North Latitude North Pole Number Oblique Ascension oblique Circle observed P R O Parallax in Latitude Parallel Planets Pleiades Point Prime Vertical Primitive Circle Prob Projection Quadrant Radius 90 right Angles Right Ascension right Circle Rising Secant Seconds Semidiameter shew Signs Sine Solar Eclipses South Sphere subtract Sun Sets Sun's Altitude Sun's Azimuth Sun's Declination Sun's Distance Sun's Place Table Tangent Tropic tude Visible Zenith

### Popular passages

Page 480 - Parts in 10, of the Space between us and the Fixed Stars can receive no greater Light from the Sun, or any of the Stars, than what we have from the Stars in a clear Night.

Page 420 - Prove that the product of the sum and difference of any two numbers is equal to the square of the first, minus the square of the second.

Page 24 - Academy for the year 1734; the subject related to the inclination of the planes of the orbits of the planets to the plane of the Sun's equator.

Page 19 - A great circle, whose poles are the poles of the •world. It divides the globe into two equal parts, the northern and southern hemispheres.

Page 1 - ANALEMMA, in geometry, a projection of the sphere on the plane of the meridian, orthographically made by straight lines and ellipses, the eye being supposed at an infinite distance ; and in the east or west points of the horizon.

Page 26 - Kepler had discovered, that the planets move in elliptical orbits, describe equal areas in equal times, and that the squares of their periodical times are as the cubes of their distances.

Page 29 - IT is well known, that the longitude of any place is an arch, of the equator, intercepted between the firft meridian and the meridian of that place ; and that this arch is proportional to the quantity of time that the fun requires to move from the one meridian to the other ; which is at the rate of 24 hours for 360 degrees; one hour for 15 degrees; one minute of time for.

Page 39 - ... equal to the sum of the apparent semidiameters of the sun and moon...

Page 33 - That every Body will continue in its State, either 'of Reft or Motion, uniformly forward in a right Line, unlefs it be made to change that State by fome Force impreflcd upon it.

Page 11 - Followers iuppofed them, to be Meteors, or Exhalations, fet on Fire in the higheft Region of the Air : The modern Aftronomers have found them to be above the Orbit of the Moon, but yet to defcend fo low, as to move in the Region of the Planets.