VIII Work with your partner asking and answering the given questions to talk about the text.

1 Do human navigators use sextants to measure the elevation angle of celestial

bodies above the visible horizon?

2 When does the peak elevation angle occur?

3 When can latitude be calculated by simple arithmetic from a table of

declination?

4 Were these fixes hand-calculated using logarithms, then plotted on charts by a

navigator?

5Whenwere hand-held bubble-level sextants built to measure the elevation of

celestial bodies from an aircraft without the need to see the horizon?

6 Where did the human navigator observe sun and stars through an astrodome?

7Was the accuracy of celestial fixes 5–50 miles in the air oron the ground?

8 Wheredoes Kayton review the history of celestial navigation?

9 When did the first automatic star trackers, build?

10 Do approximate position measurements by dead reckoning allow the telescope

to point within a fraction of a degree of the desired star?

11What does an on-board computer store?

12 Does clever design of the optics and of stellar-inertial signal-processing filters

achieveaccuracies better than 500 feet or 800 feet?

13 Where may future lower-cost systems mount the star tracker directly?

IX Do the test.

 

1 When were the first automatic star trackers built?

A) In 1930