Vocabulary for Spherical Astronomy Quiz

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For each of the following questions, click on the box and select the the single best response. The answer that shows is the answer you have selected. Some possible responses should never be selected, others should be reapeatedly selected. For 2 points, in the below example, select: Other. When you have completed the quiz click on the above "hand in quiz" button.


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The direction straight up.

The set of all possible directions with altitude 60°

The path of the Sun (over a year) on the celestial sphere.

The vertical circle including the observer's zenith, and north and south points on the horizon.

The great circle formed by the intersection of the celestial sphere with a plane perpendicular to the line from an observer to the zenith.

The most important of all circles of reference.

Any great circle on the celestial sphere which passes through the north and south celestial poles.

Any great circle passing through both the observer's zenith and nadir.

The angle eastward along the celestial equator from the vernal equinox to the foot of the hour circle through the object.

The angle from the north point of the horizon clockwise to the foot of the vertical circle through the object.

Where sky and ground meet.

The farthest points from the celestial equator.

The circle along which declination is measured.

The point where the Sun crosses the celestial equator from south to north each year.

The angle between a object on the celestial sphere and the celestial equator.

Any circle on the surface of a sphere which divides the sphere into two equal parts.

The angle from the horizon along the vertical circle to the object.

The path that a star makes in the sky over a day.