He commissioned several geographers to remeasure the distance on earth that corresponds to one degree of celestial meridian.
2.
The globe may be turned by hand within this ring, so as to place any given meridian upon it, directly under the celestial meridian " L ".
3.
On this axis is fixed the flat celestial meridian " L L ", which may be set directly over the meridian of any place on the globe, so as to keep over the same meridian upon it.
4.
While the local vertical defined at the Airy transit circle still points to the modern celestial meridian ( the intersection of the prime meridian plane with the celestial sphere ), it does not pass through the Earth's rotation axis.
5.
An alternate definition is that SHA of a celestial body is the arc of the Equinoctial or the angle at the celestial pole contained between the celestial meridian of the First point of Aries and that through the body, measured westward from Aries.
6.
The celestial meridian " L " passes through two notches in the north and south points of the horizon, as in a common globe : both here, if the globe be turned round, the horizon and meridian turn with it.
7.
When the winch is put upon the axis " V ", and turn backward, the terrestrial globe, with its horizon and celestial meridian, keep at rest; and the whole sphere of circles turns round from east, by south, to west, carrying the sun " Y ", and moon " Z ", round the same way, and causing them to rise above and set below the horizon.
8.
To rectify the sphere for use, first slacken the screw " r " in the upright stem " R ", and taking hold of the arm " Q ", move it up or down until the given degree of latitude for any place be at the side of the stem " R "; and then the axis of the sphere will be properly elevated, so as to stand parallel to the axis of the world, if the machine be set north and south by a small compass : this done, count the latitude from the north pole, upon the celestial meridian " L ", down towards the north notch of the horizon, and set the horizon to that latitude; then, turn the nut " b " until the sun " Y " comes to the given day of the year in the ecliptic, and the sun will be at its proper place for that day : find the place of the moon's ascending node, and also the place of the moon, by an Ephemeris, and set them right accordingly : lastly, turn the winch " W ", until either the sun comes to the meridian " L ", or until the meridian comes to the sun ( according as you want the sphere or earth to move ) and set the hour-index to the XII, marked noon, and the whole machine will be rectified . Then turn the winch, and observe when the sun or moon rise and set in the horizon, and the hour-index will show the times thereof for the given day.
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