Handbook of Astronomy |
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Page 9
... edge of the movable object in coincidence with the edge of the fixed object , and then reading the divisions on the micrometer - head . The screw is then turned until the movable image is on the opposite side of the fixed image when ...
... edge of the movable object in coincidence with the edge of the fixed object , and then reading the divisions on the micrometer - head . The screw is then turned until the movable image is on the opposite side of the fixed image when ...
Page 18
... edge will give the time when that edge is also on the middle wire ; the mean of these transits of the two edges , therefore , determines the clock- time of the transit of the centre of the disk over the middle wire , or a mean of all ...
... edge will give the time when that edge is also on the middle wire ; the mean of these transits of the two edges , therefore , determines the clock- time of the transit of the centre of the disk over the middle wire , or a mean of all ...
Page 21
... edge , and not on E Fo 0 Fig . 11 . the face limb . The hoop of metal thus engraved forms , therefore , what may be called the tire of the wheel . A trough o , containing mercury , is placed on INSTRUMENTS . 21 - THE MURAL CIRCLE .
... edge , and not on E Fo 0 Fig . 11 . the face limb . The hoop of metal thus engraved forms , therefore , what may be called the tire of the wheel . A trough o , containing mercury , is placed on INSTRUMENTS . 21 - THE MURAL CIRCLE .
Page 22
... edge of the instrument are num- bered as usual from 0 ° to 360 ° round the entire circle . The position which the direction of the line of collimation of the telescope has with relation to the o ° of the limb is indifferent . Nothing is ...
... edge of the instrument are num- bered as usual from 0 ° to 360 ° round the entire circle . The position which the direction of the line of collimation of the telescope has with relation to the o ° of the limb is indifferent . Nothing is ...
Page 31
... edge to edge in strong brass frames , which slide in grooves with a smooth and even motion . They are moved by fine screws which , by the intervention of cog - wheels , are turned by a pair of rods which pass along the tube of the ...
... edge to edge in strong brass frames , which slide in grooves with a smooth and even motion . They are moved by fine screws which , by the intervention of cog - wheels , are turned by a pair of rods which pass along the tube of the ...
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Common terms and phrases
altitude aphelion apparent diameter apparent magnitude apparent motion appear ascertained Astronomer Royal astronomical atmosphere attraction axis azimuth bodies C. H. F. Peters celestial equator celestial sphere centre circle clock comet conjunction density determined direction disk diurnal diurnal motion earth ecliptic edge effect elongation Engineering equal equatorial equinoxial points excentricity feet firmament fixed globe greater greatest Greenwich heavens hemisphere Herschel horizon increase inferior conjunction inferior planet instrument interval Jupiter latitude length less light line of collimation longitude lunar mass mean distance measured meridian moon moon's move nearly nebula object Observatory observed orbit parallax pendulum perihelion period phenomena planet Plate polar pole position prime vertical produced ratio represented revolution revolve right angles right ascension ring rotation satellites Saturn seen sidereal solar system sphere spots stars sun's superior conjunction supposed surface synodic period telescope terrestrial tion transit Uranus velocity visible visual wires zenith
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