## Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |

### From inside the book

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**equinoctial point**; and of adjusting the sidereal clock - 173. Determination of the instant that the sun is in the equi- noctial point , by trigonometry · - 174. Precession of the equinoxes : lengths of the tropical and si- dereal years ... Page 9

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**point**of the vernal equinox . If planes pass through PQ they will be perpendi- cular to the equator , and their ...**equinoctial**colure , and that which , being at right angles to the former , passes through p , is called the ... Page 33

... point wil be upon the produced plane of the equator in a line passing through the centre of the projection per ...

... point wil be upon the produced plane of the equator in a line passing through the centre of the projection per ...

**equinoctial points**. The straight line , PCS , will be the equinoctial colure ; and , except this and the primitive ... Page 61

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**equinoctial point**above - mentioned . Thus , the clock would show the right ascension of the mid - heaven , or meri- dian , at that instant , right ascensions being generally expressed in time . It follows , therefore , that if a ... Page 120

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**equinoctial point**, so that at a given time H ' is the moon's true right ascension ( in arc ) and PS ' her true north polar distance . At the same instant let s be the apparent place of the moon , so that H is the moon's apparent right ...### Contents

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### Common terms and phrases

aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circle colatitude computed considered correction corresponding cotan degrees described determined diameter difference disk earth ecliptic ellipse equal equator equatorial equinoctial point error expressed fixed star formula given Greenwich heliocentric horary horizontal parallax hour angle instant instrument interval latitude latter let fall mean meridian micrometer moon moon's motion movement Nautical Almanac nearly node noon nutation obliquity observed obtained P'PR parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius vector refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter sidereal sidereal clock sine solar sphere spherical triangle star's station subtracted sun's supposed surface tangent telescope transit transit telescope Trigon variation vertical wire zenith distance zero