# Popular and mathematical astronomy, with the principal formulæ of plane and spherical trigonometry

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### Conteúdo

 Chapter Page I Introductory 1 The Sun 3 Mercury 5 Venus 6 The Earth 7 The Moon 9 Mars 13 The Asteroids 14
 The Aurora Borealis 27 Meteors 28 The Zodiacal Light and Milky Way 30 Eclipses 32 The Tides 36 Circles of the Earth 38 Circles of the Heavens 41 Divisions of Time 45

 Jupiter 15 Saturn 17 Herschel 19 XH The Fixed Stars 20 Comets 22
 Chapter Page 51 To find the Latitude from an Altitude 98 To find the Longitude by a Lunar Obser 117 XrV The Transit Instrument 125

### Passagens mais conhecidas

Página 41 - Aries (the Ram), Taurus (the Bull) Gemini (the Twins), Cancer (the Crab), Leo (the Lion), Virgo (the Virgin), Libra (the Scales), Scorpio (the Scorpion), Sagittarius (the Archer), Capricornus (the Goat), Aquarius (the Water-bearer), and Pisces (the Fishes).
Página 72 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 124 - ... instrument is out of adjustment in this respect, the direct and reflected images will not coincide, but the reflected image, as the arm moves, will be slightly above or below the direct image. Adjust the horizon-glass so that the two images coincide when the reflected passes the direct in moving the arm. 3. To make the axis of the telescope parallel to the plane of the arc. Prepare two blocks which are equal in height and the same as the height of the center of the telescope above the plane of...
Página 61 - A sin(A + B) = sin A cos B + cos A sin B cos(A + B) = cos A cos B - sin A sin B...
Página 88 - The law of sines states that in any spherical triangle the sines of the sides are proportional to the sines of their opposite angles: sin a _ sin b __ sin c _ sin A sin B sin C...
Página 87 - B . sin c = sin b . sin C cos a = cos b . cos c + sin b . sin c cos b = cos a . cos c + sin a . sin c cos A cos B cos c = cos a . cos b + sin a . sin b . cos C ..2), cotg b . sin c = cos G.
Página 91 - When a ray of light passes from a rarer to a denser medium, it is bent towards the perpendicular, at the point at which it entered.
Página 75 - The sphere may be conceived to be generated by the revolution of a semicircle DAE (fig.
Página 64 - The sines of the sides of a spherical triangle are to each other as the sines of the opposite angles. Let abc (fig.
Página 54 - When you have proved that the three angles of every triangle are equal to two right angles...