Navigation And Nautical Astronomy
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Alt. Sun's L. L. 33 18' 50" 22 30 27 50 November 15th, at G. M. Noon, the chronometer was 3 h. 17m. -33s. Fast on G. M. T. , rate 4 s. Gaining.
Observation for deviation.
Sun bore by compass N 79 40' W ; chronometer showed 1 h. Om. 57s. The index error for all observations was 1' 50" +, and the height of tlu> eye was 24 feet.
CHAPTER XVI. LONGITUDE BY LUNAR.
Longitude by Lunar Observations.
147. As the moon revolves round the earth, it is seen to be continually changing its distance from the su...n and certain of the bright stars which lie near its path. The angular distance of the moon from such of these bodies as are conveniently situated has been calculated and inserted in the Nautical Almanac for intervals of three hours of Greenwich time, viz. At noon, 3 h. , 6 h. , etc.
These distances are such as would be seen from the centre of the earth. Hence, the distance which an observer measures, or the apparent distance, must be corrected for the effects of parallax and refraction so as to obtain the true distance at the time of observation as referred to the centre of the earth.
What to read after Navigation And Nautical Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Frank Cole Stebbing to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Alt. Sun's L. L. 33 18' 50" 22 30 27 50 November 15th, at G. M. Noon, the chronometer was 3 h. 17m. -33s. Fast on G. M. T. , rate 4 s. Gaining.
Observation for deviation.
Sun bore by compass N 79 40' W ; chronometer showed 1 h. Om. 57s. The index error for all observations was 1' 50" +, and the height of tlu> eye was 24 feet.
CHAPTER XVI. LONGITUDE BY LUNAR.
Longitude by Lunar Observations.
147. As the moon revolves round the earth, it is seen to be continually changing its distance from the su...n and certain of the bright stars which lie near its path. The angular distance of the moon from such of these bodies as are conveniently situated has been calculated and inserted in the Nautical Almanac for intervals of three hours of Greenwich time, viz. At noon, 3 h. , 6 h. , etc.
These distances are such as would be seen from the centre of the earth. Hence, the distance which an observer measures, or the apparent distance, must be corrected for the effects of parallax and refraction so as to obtain the true distance at the time of observation as referred to the centre of the earth.
What to read after Navigation And Nautical Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Frank Cole Stebbing to read onlineMoreLess
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