EXERCISES XVII. B1. An observation taken in New York (40° 43' N) showed thealtitude 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 thedeclination of the sun was 8° 0' S, find the local apparenttime of the observation.3. Find the altitude and the azimuth of the sun at 3 p.m. inlatitude 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. Findthe 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 observer.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 problemsof this type for the refraction of the rays of the sun by theatmosphere of the earth. Another correction must be madefor 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 is23° 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 2451. 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

To find the local apparent time of the observation, we can use the following formula:Where:Solar…

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

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Given the following data for sightings made on the sun: Latitude of the place of observation = N17⁰22'The temperature during observation = 23.89⁰CElevation of place of observation = 1,682.317 mMeridian of the place of observation = 120⁰ EastDate of observation = June 22,1977 The transit is set up at A and a mark is placed on B.Determine the following:a) Mean horizontal angle from mark to Sun b) Mean vertical angle to the sunc) Mean time at the place of observationd) GCT when the observation was madee) Sun's apparent declination on date and time of observationf) True altitude of the sun corrected for refraction and parallaxg) The value of angle Z and the sun's true bearingh) True bearing of the line AB
Local mean time of a place of longitude of 45°30' E is 8h 43m 14s AM. The corresponding Greenwich Mean Time (GMT) is (a) 5h 41m 14s PM (c) 11h 45m 14s AM (b) 11h 45m 14s PM (d) 5h 41m 14s AM
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Please help with b, i & ii The slope distance between two stations A and B measured with EDM when corrected for meteorological conditions and instrument constants, is 113.893 m. The heights of the instrument and reflector are 1.739 m and 1.839 m, respectively, above the ground. To measure the vertical angle a theodolite was set up at A, 1.665 m above the ground and a target at B having height above the ground as 1.632 m. The measured angle above the horizontal was + 4°22′18″. Determine a. The horizontal length of the line AB. b. To what precision the slope angle be measured: i. if the relative precision of the reduced horizontal distance is to be 1/100000. ii. if the reduced horizontal distance is to have a standard error of ± 1.8 mm.