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| annular eclipse |
an eclipse of the sun in which a ring-shaped portion of the sun remains visible around the moon. |
| apogee |
the point in the orbit of the moon or of a man-made satellite that is farthest from the earth. (Cf. perigee.) [1/2 definitions] |
| Artemis |
in Greek mythology, a goddess associated with the moon, virginity, and hunting; Diana. |
| aureole |
an encircling region of light, esp. in artistic representations of a god or holy figure, or around an astronomical object such as the moon; halo; corona. |
| celestial body |
a natural object found outside earth's atmosphere, such as a planet, moon, star, or asteroid. |
| celestial navigation |
navigation based on the position of the sun, moon, and stars. |
| circumlunar |
revolving around or surrounding the moon. |
| cislunar |
lying between the earth and the moon's orbit; on this side of the moon. |
| crater |
a bowl-shaped depression with a raised rim, such as the mouth of a volcano or geyser, or the circular depressions on the surface of the moon, usu. with a mountain at their center. [1/3 definitions] |
| crescent |
the shape of the moon as it appears in its first or last quarter, an arc tapering to a point at either end. [3/5 definitions] |
| crust |
the outer portion of the earth or other planet, or of a moon. [1/7 definitions] |
| decrescent |
decreasing or waning, as the moon. |
| Diana |
in Roman mythology, a goddess associated with the moon and hunting, and a protector of women; Artemis. |
| Easter |
a yearly Christian festival that is held on the first Sunday after the first full moon following the spring equinox, to celebrate the resurrection of Jesus Christ. [1/2 definitions] |
| eclipse |
at a particular observation point, the blocking of light from one celestial body by another, such as the eclipse of the sun by the interposition of the moon, or the eclipse of the moon by the earth's coming between the sun and moon. [1/6 definitions] |
| first quarter |
the phase of the moon's reflection of sunlight that occurs when the right half of the moon, as seen from the Northern Hemisphere, is radiant, about one week after the new moon. |
| full moon |
the moon when it is on the side of the earth opposite the sun, and visible as a bright full circle. [2 definitions] |
| gibbous |
of a planet or the moon, rounded outward at both edges; between half full and full in illumination. |
| gravimeter |
an extremely sensitive device for measuring variations in the gravitational field of the earth or the moon. [1/2 definitions] |
| half-moon |
the moon in the first or last quarter, when half its disk is illuminated. [2 definitions] |
| halo |
any circle or band of light produced by reflection or refraction of light by ice crystals suspended in the earth's atmosphere, as around the sun or moon. [1/2 definitions] |
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