On Finding the Latitude And Longitude in Cloudy Weather And At Other Times
On Finding the Latitude And Longitude in Cloudy Weather And At Other Times
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To quickly assess the difficulty of the text, read a short excerpt:
156 and 30 -78-0 119, 20 = 40-7* 94 and d. Lat. 37'3=( Ans. H. A. 4h. 26m.
Example 2 (above) A. 131, B. 84, C. 99.
Dist. Co. Dep.
131 and 12 = 27'2 84 8-ll'7 99 and d. Lat. 38'9 = Ans. H. A. 4h. 28m.
Example 1 gives the H. A. Within 1m. 11s. , and Example 2 within 19 sec. , thus affording a ready way of correcting the ship's clock when rapidly changing the longitude.
The observations should not be taken when the sun is within two or three points of the Meridian.
* If the second dep. Is greater ...than the first, when lat. And dec. Are of the same name, subtract the H. A, from 12 hours.
50 TO IDENTIFY AN UNKNOWN BEIGHT STAE.
If, on a cloudy night, a bright star appeared for a short time through an opening in the clouds, and we wished to ascertain its name, we could do -so as follows : (1) Observe the star's altitude, and bearing by azimuth compass, to which apply the usual corrections. (2) Convert the bearing into time, and consider it as an H. A. ; also consider the altitude as declination of the same name as the latitude.
What to read after On Finding the Latitude And Longitude in Cloudy Weather And At Other Times?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Challice Johnson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
156 and 30 -78-0 119, 20 = 40-7* 94 and d. Lat. 37'3=( Ans. H. A. 4h. 26m.
Example 2 (above) A. 131, B. 84, C. 99.
Dist. Co. Dep.
131 and 12 = 27'2 84 8-ll'7 99 and d. Lat. 38'9 = Ans. H. A. 4h. 28m.
Example 1 gives the H. A. Within 1m. 11s. , and Example 2 within 19 sec. , thus affording a ready way of correcting the ship's clock when rapidly changing the longitude.
The observations should not be taken when the sun is within two or three points of the Meridian.
* If the second dep. Is greater ...than the first, when lat. And dec. Are of the same name, subtract the H. A, from 12 hours.
50 TO IDENTIFY AN UNKNOWN BEIGHT STAE.
If, on a cloudy night, a bright star appeared for a short time through an opening in the clouds, and we wished to ascertain its name, we could do -so as follows : (1) Observe the star's altitude, and bearing by azimuth compass, to which apply the usual corrections. (2) Convert the bearing into time, and consider it as an H. A. ; also consider the altitude as declination of the same name as the latitude.
What to read after On Finding the Latitude And Longitude in Cloudy Weather And At Other Times?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Challice Johnson to read onlineMoreLess
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