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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 hollow area shaped like the inside of a bowl. The mouth of a volcano is a crater, and the moon has many craters on its surface. |
| crescent |
the shape of the moon when it looks to us like a narrow arc. The moon appears as a crescent in its first and last quarters. [3 definitions] |
| crust |
the outer layer of Earth, another planet, or a moon. [1/5 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 Christian holiday to celebrate that Jesus Christ returned to life after he died. Easter is held every spring on the Sunday after the first full moon between March 21 and April 25. |
| eclipse |
the blocking from view of the sun, a moon, or a planet by another heavenly body. In an eclipse of the sun, the sun is hidden from earth's view by the moon passing between the sun and the earth. [1/3 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 Earth that is opposite the sun and looks from Earth like a complete 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 that appears around a source of light, such as the sun or moon. [1/2 definitions] |
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