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| almanac |
a compendium of astronomical and meteorological statistics and projections. [1/3 definitions] |
| astrodome |
a transparent dome mounted on the top of an aircraft fuselage to facilitate the use of navigational or astronomical instruments. |
| astrophotography |
the photographing of astronomical objects. |
| 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. |
| dead reckoning |
the calculation of the position of a ship or airplane on the basis of speed, distance, wind speed, and currents, rather than on more accurate astronomical observations. |
| emersion |
the reappearance of an astronomical body from concealment by another, as by an eclipse; egress. (Cf. immersion.) |
| geology |
the study of the physical structure, composition and development of the earth or other solid astronomical bodies, esp. with regard to rocks and land forms. [2 definitions] |
| leap year |
a year in the Gregorian calendar having 366 days which occurs every four years, the extra day, February 29, making up the quarter day difference between the common year and the astronomical year. [1/2 definitions] |
| megaparsec |
a unit of astronomical distance equal to one million parsecs. |
| nonastronomical |
combined form of astronomical. |
| observatory |
a building containing equipment for making astronomical or other kinds of scientific observations. |
| parsec |
a unit of astronomical distance equal to 3.258 light years. |
| pulsar |
any of various astronomical objects, probably rapidly rotating neutron stars, that emit short, repeating pulses of radio waves. |
| quasar |
any of numerous astronomical objects that emit powerful radio waves and have red shifts associated with great distance from earth; quasi-stellar radio source. |
| solar year |
see "astronomical year." |
| year |
see "astronomical year." [1/5 definitions] |
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