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单词 astronomical twilight
释义

astronomical twilight


astronomical twilight

See: twilight.

astronomical twilight


astronomical twilight

See twilight.

astronomical twilight

[‚as·trə′näm·ə·kəl ′twī‚līt] (astronomy) The period of incomplete darkness when the center of the sun is more than 6° but not more than 18° below the celestial horizon.

astronomical twilight

The period before sunrise and after sunset when sun's center is between 12° and 18° below sea-level horizon. This may be regarded for all practical purposes as synonymous with complete darkness.
MedicalSeetwilight
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