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2. An afternoon observation at Montreal (45° 30' N) deter- mined the altitude of the sun to be 26° 30'. Given that the declination of the sun was 8° 0' S, find the local apparent time of the observation.

2. An afternoon observation at Montreal (45° 30' N) deter- mined the altitude of the sun to be 26° 30'. Given that the declination of the sun was 8° 0' S, find the local apparent time of the observation.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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EXERCISES XVII. B 1. An observation taken in New York (40° 43' N) showed the altitude of the sun to be 52° 25'. Its declination was found *Discarded, since Z and z must terminate in the same quadrant. to be 12° 15'. What was the local apparent time of the obser- vation if it was taken in the morning? 2. An afternoon observation at Montreal (45° 30' N) deter- mined the altitude of the sun to be 26° 30'. Given that the declination of the sun was 8° 0' S, find the local apparent time of the observation. 3. Find the altitude and the azimuth of the sun at 3 p.m. in latitude 47° 38' N, its declination being 7° 18'. 4. The declination of a star is 22° 1', its hour angle is 15° 8'. The latitude of the place of observation is 51° 19' N. Find the altitude and the azimuth of the star. 5. The declination of a star is -26° 19', its altitude is 31° 5', and its azimuth is S 18° 9' W. Find the latitude of the ob server. 6. The altitude of the sun is 50° 32', its declination is 12° 38', its azimuth S 12° 6' W. Find the latitude and the local appar- ent time. 7. Find the local apparent time of sunset in Chicago (41° 50' N) on a day when the declination of the sun is -7° 30'. SUGGESTION. At sunset the altitude of the sun is 0°. NOTE. In practice a correction must be made in problems of this type for the refraction of the rays of the sun by the atmosphere of the earth. Another correction must be made for the angular radius of the sun. 8. Find the length of the day (sunrise to sunset) in New Orleans (29° 57' N) when the declination of the sun is -20°. 9. On the longest day of the year the declination of the sun is 23° 27'. Find the length of the longest day in latitude (a) 25°, (l) 45°, (c) 65°. 10. On the shortest day of the year the declination of the sun is -23° 27'. Find the length of the shortest day in latitude (a) 25°, (b) 45°, (c) 65°. ANSWERS: Exercises XVII. B, page 245 1. 10:08 a.m. 3. 34° 30', S 58° 20' W. 5. 30° 13' N. 9. (a) 13h 33m; (b) 15h 26m; (c) 21h 8m. 7. 5:33 p.m
Transcribed Image Text:EXERCISES XVII. B 1. An observation taken in New York (40° 43' N) showed the altitude of the sun to be 52° 25'. Its declination was found *Discarded, since Z and z must terminate in the same quadrant. to be 12° 15'. What was the local apparent time of the obser- vation if it was taken in the morning? 2. An afternoon observation at Montreal (45° 30' N) deter- mined the altitude of the sun to be 26° 30'. Given that the declination of the sun was 8° 0' S, find the local apparent time of the observation. 3. Find the altitude and the azimuth of the sun at 3 p.m. in latitude 47° 38' N, its declination being 7° 18'. 4. The declination of a star is 22° 1', its hour angle is 15° 8'. The latitude of the place of observation is 51° 19' N. Find the altitude and the azimuth of the star. 5. The declination of a star is -26° 19', its altitude is 31° 5', and its azimuth is S 18° 9' W. Find the latitude of the ob server. 6. The altitude of the sun is 50° 32', its declination is 12° 38', its azimuth S 12° 6' W. Find the latitude and the local appar- ent time. 7. Find the local apparent time of sunset in Chicago (41° 50' N) on a day when the declination of the sun is -7° 30'. SUGGESTION. At sunset the altitude of the sun is 0°. NOTE. In practice a correction must be made in problems of this type for the refraction of the rays of the sun by the atmosphere of the earth. Another correction must be made for the angular radius of the sun. 8. Find the length of the day (sunrise to sunset) in New Orleans (29° 57' N) when the declination of the sun is -20°. 9. On the longest day of the year the declination of the sun is 23° 27'. Find the length of the longest day in latitude (a) 25°, (l) 45°, (c) 65°. 10. On the shortest day of the year the declination of the sun is -23° 27'. Find the length of the shortest day in latitude (a) 25°, (b) 45°, (c) 65°. ANSWERS: Exercises XVII. B, page 245 1. 10:08 a.m. 3. 34° 30', S 58° 20' W. 5. 30° 13' N. 9. (a) 13h 33m; (b) 15h 26m; (c) 21h 8m. 7. 5:33 p.m
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