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Chapter's 3 and 4 Crossword Puzzle

Astronomy
Across
The north celestial pole currently Polaris.
The very slowly changing position of the stars due to the change in orientation of the Earth's axis.
The part of the shadow from which the Sun's disk is only partially occulted.
Celestial longitude, measured eastward along the celestial equator in hours of time from the vernal equinox.
The hypothetical sphere centered at the center of the Earth to which it appears that the stars are affixed.
An aberration that occurs when light of different colors do not reach the same focus.
Telescopes that use lenses to collect light.
The varying shape of the lighted part of a planet or moon as seen from some vantage point.
A common type of electronic detector that is extremely sensitive to light.
The path of the Sun across the sky.
Down
The ability of an optical system to distinguish detail.
Celestial latitude, measured in degrees north or south of the celestial equator.
Famous American space telescope that detects mostly in the optical range.
A technique that allows astronomers to achieve very clear images over small fields of view.
Upcoming space telescope that is scheduled to replace Hubble.
Telescopes that use mirrors to collect light
The calendar in current use in the western world.
A type of aberration that occurs when parallel light is not reflected/refracted to a good focus.
The passage of all or part of one astronomical body into the shadow of another.
Imaginary north-south line extending through the zenith.