Sextant (1 янв 1643 г. – 1 янв 1727 г.)
Описание:
A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. found around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was also found later in the unpublished writings of Isaac Newton (1643–1727).Добавлено на ленту времени:
Дата:
1 янв 1643 г.
1 янв 1727 г.
~ 84 years