NavList:

Thanks to Philip Bailey for his account of the recent correspondence
in Journal of Navigation. I found the Zevering reponse just as
confusing, and confused, as he did; but then I would be biased in that
direction, wouldn't I?

It strikes me that perhaps NavList members might like to tackle the
simple test-problem that I set, as follows-

1. An observer, at position P1, measures the altitude of a star S1, at
(Dec1 = 0, SHA1 = 0), to be 30 degrees.

2. Then he travels due North by 60 nautical miles (= 1 degree), to P2.

3.. From there, he observes another star S2 (then at Dec2 = N 1
degree, SHA2 = W 45 degrees) to be at an altitude of 45 degrees. Where
on Earth is he then?

and concluded-

"I challenge Zevering to apply his procedure to the problem as set out
above, to provide us with initial and final positions for the
observer, the initial altitude of star S1, and the final altitude of
star S2."

In his reply, Herman Zevering has not responded to that challenge,
from which NavList members may draw their own conclusions.

But what solutions do NavList members arrive at, I wonder, if they
pick up that same challenge, using any method they think appropriate?

George.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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