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Aldebaran altitude analemma angle apogee appears ascension and declination astronomical axis brazen colure brazen hour-circle brazen meridian brazen parallel bring called Canis Minor catalogue celestial globe circle of progression clamp the flexible constellation departure described direction distance diurnal motion Draco earth east of Greenwich eastward ecliptic edge elevated equator fixed stars flexible arc full moon given place heavens heliacal rising hour hour-angle interval latitude leap-year Leo Minor Leonis longitude mean noon mean solar mean sun measured miles minutes moon's move node north pole Ophiuchus opposite orbit Orion parallax passed the meridian perigee planets planisphere position precession reckoned retrogradation revolution revolve right ascension rises or sets round secondary seen semidiameter sidereal clock sidereal day solar day south pole spectator sphere subtract sun-dial supposed Tauri terrestrial globe tion true sun tude turn the globe Ursa vernal equinox vertical visible west to east wooden horizon zenith zodiac
Page 5 - For the purpose of measuring angles, the circumference is divided into 360 equal parts, called degrees; each degree into 60 equal parts, called minutes; each minute into 60 equal parts, called seconds.
Page 63 - Tofind the latitude and longitude of a star* RULE. Place the upper end of the quadrant of altitude on the north or south pole of the ecliptic, according as the star is on the north or south side of the ecliptic, and move the other end till the star comes to the graduated edge of the quadrant : the number of degrees between the ecliptic and the star is the latitude ; and the number of degrees on the ecliptic, reckoned eastward from the point Aries to the quadrant, is the longitude.
Page 5 - For this purpose the circle is divided into 360 equal parts, each of which is called a degree.
Page 24 - Lettering.— The lettering of the .surveyor's compass is at first confusing to those learning its use. A person standing with his back to the south and facing the north will have the east on his right hand and the west on his left. These latter directions, viz., the east and the west, are reversed in the lettering of the compass. The reasons for this apparent error are explained in the following figures: FIG.
Page 46 - ... spectator at this place, as we have already shown, the poles of the earth and heavens will lie on the horizon. Leaving the equator and travelling due north along a meridian-line, fore very degree we go north it is evident the pole of the heavens will rise one degree above the horizon ; and when we reach the north pole of the earth, the north pole of the heavens will be on the zenith, or ninety degrees above the horizon. Thus it appears that the latitude of any place is equal to the elevation...
Page 121 - The perennial globe * is a contrivance in which there is a motion of the stars about the pole of the ecliptic, and also one about the pole of the equator, so that all the diurnal phenomena can be represented for any epoch, however distant from our own, past or future.
Page 71 - ... the sun's motion in the ecliptic ; but if the sun moved uniformly in the 'equator, at such a rate as to complete the ' annual circuit in the heavens in the same time as he does by his actual motion in the ecliptic, time measured by his motion would then correspond with that of a well-regulated clock. The difference between the time shown by the sun-dial and that shown by the clock, is called the equation of time.
Page 99 - IXI .To find the Place over which the Sun is vertical at any Hour of a given Day. • Find the fun's declination for the given day, (by Problem VII.) which mark on the brazen meridian; then bring the place where you are...
Page 100 - If twilight begins or ends when the sun is 18° below the horizon, show that all places have a day of more than twelve hours, including twilight, so long as the declination of the sun is less than 18°.
Page 59 - cause I am not so. Org. I can endure no longer. If your spleen Lie in your breech, thus I will kick it up [He kicks him. Aor. Alpha, Beta, Gamma, Delta, Epsilon, Zeta, Eta, Theta, Iota, Kappa, Lambda, Mu, Nu, Xi, Omicron, Pi, Ro, Sigma, Tau, Upsilon, Phi, Chi, Psi, Omega. Org. How ! what contempt is this ? Aor. An antidote. Against the poison anger. 'Twas prescrib'd A Roman emperor, that on every injury Repeated the Greek alphabet : J that being done, His anger too was over.