Nautical words



Download 2.28 Mb.
Page583/963
Date29.06.2021
Size2.28 Mb.
#147476
1   ...   579   580   581   582   583   584   585   586   ...   963
Noctilucent Clouds. Luminous cirriform clouds, travelling at high speed, occasionally seen about midnight after summer solstice.

Nocturlabium.* The 'Nocturnal' instrument.

Nocturnal. Pertaining to night. 2. Early 16th-century instrument used for determining latitude by observations of Polaris. Had a base plate, graduated for time and date, on which was a disc graduated in arc. When inner disc was set to time and date the instrument was suspended vertically and a pointer, pivoted at centre of disc, was sighted on Polaris. Pointer then indicated altitude of Pole. Invented 1520.

Nocturnal Arc. Arc above horizon described by a heavenly body during hours of darkness.


Download 2.28 Mb.

Share with your friends:
1   ...   579   580   581   582   583   584   585   586   ...   963




The database is protected by copyright ©essaydocs.org 2022
send message

    Main page