 Check out the bookstore at IRBS.com |
|
|
|
|||||
|
||||||
Subject: HO 211 variant
From: Paul Hirose (71202.2014@XXX.XXX)
Date: Sun Oct 03 1999 - 15:35:02 EDT
The traditional format for HO 211 sight reduction is cleverly laid
out, but also uses quite a bit of space:
t 156 54 A 40634
d S 56 44 B 26079 A 7773
R A 66713 B 1029 B 1029 A 66713
K S 121 07 A 6744
L S 53 30
K-L 67 37 B 41930
hc 21 50 A 42959 B 3233
Z W 13 A 63480
I've developed a slight variation by shifting the last two columns to
the left to use that empty space:
t 156 54 A 40634
d S 56 44 B 26079 A 7773
R A 66713 B 1029
K S 121 07 A 6744
L S 53 30 1029
K-L 67 37 B 41930 66713
hc 21 50 A 42959 B 3233
Z W 13 A 63480
One column is all additions and the other all subtractions, as before.
I don't mark 1029 as B, because that implies it's B of 53 30', which
it is not. It's just copied down from the R row. Same for 66713.
Advantage for this method is a more compact arrangement. On a plain
sheet of 8.5" wide paper I can work out meridian angle on the left, put
the above items in the middle, and compute altitude corrections and
intercept on the right. It all fits without writing tiny.
Obvious disadvantage is that you have A and B of R not in their
"correct" locations, opening the door to mistakes. But I must say
that although I've botched HO 211 reductions, it's never been for that
reason.
For real celestial navigation I recommend using a form, but "blank
page" sight reduction is a good training exercise. If you're expert
with a method, I think you ought to be able do the entire reduction by
heart. It sure feels good to have that ability.
|