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Author
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Topic: Exercise 9.7 in Celestial Navigation Book
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leslieg
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posted April 03, 2023 10:05 AM
When you subtract 11 hours from 5 hours what do you get? It’s 9.7 moon Arcturus ZD correction. I keep getting 18 and figure what I am doing wrong.
Why is the d value for the moon in 9.7 negative when it is increasing in value on the daily page?
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David Burch
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posted April 03, 2023 10:39 AM
When you subtract 11 hours from 5 hours what do you get?
==== 5 - 11 = -6
It’s 9.7 moon Arcturus ZD correction. I keep getting 18 and figure what I am doing wrong.
==== The zone description is given, ie a property of the watch. It is not computed. (If i understand your question properly.)
Why is the d value for the moon in 9.7 negative when it is increasing in value on the daily page?
=== the d value sign refers to the value of the declination with time, not how the d value itself is changing.
this is a case where the dec is getting smaller with time (hence a - d) but it happens to be smaller faster with time
From: Starpath, Seattle, WA
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