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Author
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Topic: Sight Reduction tables Z value discrepancy
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eutectic77
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posted December 11, 2020 08:12 AM
I have come across what looks like a discrepancy in the Z value between the “Declination (0°-14°) Same Name Latitude” table in the class textbook and “Pub. 249 Vol. 3 Sight Reduction” table from the link “Celnav Course Material page” from Quiz CN07 and I’m not sure if I’m looking at this right. I came across this while working “7.4 Altair Sight Exercise, Star #3”.
For a-lat = 45°N, Dec=N8°, LHA=305°
Box 5 tab Hc (textbook) = 30° 00’ +45 111°
Box 5 tab Hc (online link to Pub 249). = 30° 00’ +45 110°
Shouldn’t these tables have the same values?
Thank you
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eutectic77
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posted December 11, 2020 11:54 AM
Great, the link you provided explained this situation well.
The resulting rounding difference is an insignificant factor in our Zn calculations and the Z value could be slightly different, because of rounding, depending on the publication source used for sight reduction.
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