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ORBIT |
Circle (Earth) |
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MERIDIAN |
Great circle of earth |
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EQUATOR |
Great circle of earth |
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TETRAGON |
An aspect of two planets with regard to the earth when
they are distant from each other ninety degrees, or the fourth of a
circle. |
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INCLINNOMETER |
An apparatus to determine the inclination of the
earth's magnetic force to the plane of the horizon; -- called also
inclination compass, and dip circle. |
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CIRCUIT |
The act of moving or revolving around, or as in a circle
or orbit; a revolution; as, the periodical circuit of the earth round
the sun. |
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HORIZON |
The circle which bounds that part of the earth's surface
visible to a spectator from a given point; the apparent junction of the
earth and sky. |
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DEFERENT |
An imaginary circle surrounding the earth, in whose
periphery either the heavenly body or the center of the heavenly body's
epicycle was supposed to be carried round. |
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TRIOCTILE |
An aspect of two planets with regard to the earth when
they are three octants, or three eighths of a circle, that is, 135
degrees, distant from each other. |
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ECLIPTIC |
A great circle of the celestial sphere, making an angle
with the equinoctial of about 23¡ 28'. It is the apparent path of the
sun, or the real path of the earth as seen from the sun. |
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ELLIPTICITY |
Deviation of an ellipse or a spheroid from the form of
a circle or a sphere; especially, in reference to the figure of the
earth, the differenc... |
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EQUATORIAL |
...d as
to have two axes of motion at right angles to each other, one of them
parallel to the axis of the earth, and each carrying a graduated
c... |