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Author
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Topic: Ex. 9.8 - Moon-Arcturus Fix, Star #9
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Rich A
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posted August 11, 2016 08:41 PM
The Ha is 9 deg 21 min. The chart for altitude correction does not have a listing for anything below 9 deg 56 min.
The stated answer (pg 239) for alt corr is - 5.9 min.
How do you find this altitude correction?
Rich
From: Lacey
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David Burch
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posted August 17, 2016 09:43 AM
I apologize. We missed this question. Back to you shortly with an answer.
From: Starpath, Seattle, WA
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Rich A
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posted August 17, 2016 09:49 AM
Thanks .. I have been stuck for a week and pulling my hair out thinking I missed something simple (which I hope I didn't)
Rich
From: Lacey
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David Burch
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posted August 17, 2016 09:55 AM
We do not include those low Ha corrections because in principle we should try to avoid sights that low, but it seems this one slipped in. You can get a copy of the corrections here http://www.starpath.com/cgi-bin/web_card/res.pl?fn=/celestial/82_na_selections.pdf
which is from our online Resources, under Miscellaneous. However, when you do check that please note the Ha minutes are 2.1' not 21', which changes this correction by 0.2'... ie this sensitivity is part of the reason we try to avoid sights lower than about 15º when possible.
From: Starpath, Seattle, WA
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David Burch
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posted August 17, 2016 10:01 AM
Moving forward, if you do not hear from us within 48h of posting, then please call us 206-783-1414 or send an email to [email protected]
When we do not answer within that time frame, as in this case, i am sorry to say, it means we missed the question.
From: Starpath, Seattle, WA
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Rich A
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posted August 17, 2016 10:01 AM
right - thank you .. and I had 2.1 on my worksheet, just transposed it wrong here .. I will look up that link and continue on
Rich
From: Lacey
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