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Re: Leg 67 - I give up!
From: Dan Hogan
Date: 2000 Jul 20, 09:30 EDT
From: Dan Hogan
Date: 2000 Jul 20, 09:30 EDT
Paul: Sorry my GOOF! See below and revised Leg 67 posted same time as this message. On 20 Jul 2000, at 2:47, Paul Hirose wrote: > After wasting far too much time today on Leg 67, I'm giving up. Have > not been able to solve the celestial fix. The problem is that only the zone > time of the shots is given. Not having worked any of the recent Silicon Sea > legs, I don't have the dead reckoning longitude necessary to convert zone > time to UT. Apply the Zone Description(ZD) to the ZT for UTC time. ZD= DR Lon / 15 > >From the wording of the problem, I inferred that sailing 614 mi on > course 290 would take us toward Barbados, but we wouldn't be there > yet. So, with a small scale chart, I backed up 700 mi from Barbados on the > reciprocal course, and took that as the assumed position for my sight > reduction. My LOPs showed the guess was far off, but they did cluster well > enough for me get an improved assumed position. With that and a > larger-scale chart I re-reduced the sights. Unfortunately, the first two > sights I reduced still had big intercepts. At that point I called it quits. > No doubt some blunders on my part have not helped; I haven't done celestial > in a long time. Paul: My apploogies. I left out the EP position. EP= (02d 22.8'N 29d 24.9'W) [Snip correct assumption and tedious practice] Dan Hogan dhhogan@XXX.XXX