| 11. | Not depending on celestial navigation, they invested their efforts in radio navigation systems.
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| 12. | Arab navigational tools like the astrolabe and quadrant were used for celestial navigation.
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| 13. | Besides his research, he taught celestial navigation and time measurement to college students.
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| 14. | Both marine chronometers to determine longitude by means of celestial navigation.
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| 15. | During World War II the planetarium was used to train pilots in celestial navigation.
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| 16. | SHA is often used in celestial navigation and navigational astronomy.
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| 17. | Huston provided training for the Mercury astronauts in celestial navigation.
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| 18. | Columbus sailed without celestial navigation, without longitude, without any reliable way to measure speed.
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| 19. | Celestial navigation has been taught since the academy was established.
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| 20. | As so often in her earlier fiction-- " Celestial Navigation,"
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