# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Lat/Lon by "Noon Sun" & The Noon Fix PROVE IT
From: George Huxtable
Date: 2009 Apr 28, 17:28 +0100

```Jim wrote, in [8068]

| Thanks for your offer, and I would like a set of simulated sights
| starting forty minutes before maximum altitude. This is what I would do
| if I faced a real situation. I would also increase the number of sights,
| like maybe to seven, to better determine the slope of the altitude-time
| lines. I prefer the one minute spacing, since that's close to natural.
|
| We have to get to a region where the data scatter is much less than the
| data change.

Thanks to Dave Walden, I can offer a set of predicted numbers that we hope
will come close to Jim's needs. Unhappily, as a result of pressures from the
Real World outside navlist, I just don't have time, over the next few days,
to format them into a decent table as I did last time. Nor have I translated
the altitudes  into degrees and minutes, as I undertook to do. Sorry about
that. If Jim finds himself struggling with those somewhat inscrutable
numbers, I can give that formatting some attention from the coming weekend.
But perhaps, if he does his best with the numbers that are supplied here, he
can at least test whether they are suitable for his procedure to work.

Here's some guidance to decoding the data block below. Each set of
around-noon observations occupies 6 rows of text. On the first two or three
rows are a list of 19 GMT times of observation, extended to suit Jim
Wilson's wishes. Each data-set always starts with an observation at 12:00
hrs (shown simply as 12: ), then 12:01 (shown as 12:1), and in steps of 1
minute up to 12:05, then a time gap until the 7th observation at 12:25 and
every 5 minutes until the 11th obs. at 1t 12:50. Then there's a variable
wait, until the first moment that an observation, tested at each minute,
falls below the altitude that was noted at 12:05 (the sixth obs.). This is
noted with its (unpredictable) time, as the 13th observation, and then 6
further observations are taken, at 1 minute intervals. Following the 19th
time, on the third row, is a many-digit increasing code-word, just to
uniquely identify each data set.

The next 3 rows are the 19 altitudes, corresponding in order to the times
listed above, in decimal degrees.

Then the next data set starts. There are 10 such sets altogether, but it may
become apparent to Jim, long before he has worked his way through all 10,
whether or not they provide suitable meat for his method.

George.

=================================

12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 12 : 59 13 : 13 : 1 13 : 2 13 : 3 13 : 4 13 : 5
39930.595601
10.0557 10.0511 10.0945 10.0942 10.1406 10.1179 10.3407 10.3359
10.3640 10.3378 10.3187 10.2728 10.1300 10.1274 10.1283 10.1114
10.1036 10.0668 10.0333
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 10 13 : 11 13 : 12 13 : 13 13 : 14 13 : 15
13 : 16 39930.595727
10.5200 10.5272 10.5666 10.6252 10.6287 10.6531 10.8813 10.9516
10.9348 10.9591 10.9307 10.8767 10.6449 10.6315 10.5889 10.5747
10.5719 10.5467 10.5135
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 9 13 : 10 13 : 11 13 : 12 13 : 13 13 : 14 13 :
15 39930.595730
10.6518 10.6893 10.7093 10.7298 10.7346 10.7512 11.0330 11.0392
11.0652 11.0328 11.0550 10.9623 10.7553 10.7267 10.7225 10.6738
10.6431 10.6420 10.6061
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 9 13 : 10 13 : 11 13 : 12 13 : 13 13 : 14 13 :
15 39930.595732
10.6325 10.6549 10.6610 10.6638 10.6609 10.7101 10.9721 10.9728
10.9777 11.0157 10.9938 10.9333 10.7002 10.6784 10.6300 10.6200
10.5873 10.6008 10.5461
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 12 : 58 12 : 59 13 : 13 : 1 13 : 2 13 : 3 13 : 4
39930.595735
10.0302 10.0465 10.0741 10.0547 10.0852 10.1464 10.3425 10.3984
10.3617 10.3593 10.3504 10.2860 10.1557 10.1482 10.1599 10.1522
10.1469 10.1398 10.0744
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 10 13 : 11 13 : 12 13 : 13 13 : 14 13 : 15
13 : 16 39930.595738
9.7458 9.7585 9.8075 9.8094 9.8449 9.8739 10.1160 10.1673 10.1525
10.1540 10.1448 10.1108 9.8677 9.8285 9.8078 9.8058 9.7717 9.7785
9.7270
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 12 : 58 12 : 59 13 : 13 : 1 13 : 2 13 : 3 13 : 4
39930.595741
10.4809 10.5234 10.5263 10.5312 10.5602 10.5674 10.7533 10.8123
10.7716 10.7700 10.7457 10.6881 10.5805 10.5590 10.5174 10.5320
10.4828 10.4828 10.4746
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 1 13 : 2 13 : 3 13 : 4 13 : 5 13 : 6 13 : 7
39930.595744
10.0392 10.0245 10.0324 10.0699 10.0768 10.1146 10.3158 10.3493
10.2998 10.3289 10.2965 10.2593 10.1022 10.0764 10.0709 10.0931
10.0544 10.0408 9.9862
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 13 : 7 13 : 8 13 : 9 13 : 10 13 : 11 13 : 12 13 :
13 39930.595747
9.9665 9.9873 9.9799 10.0136 10.0592 10.0465 10.3118 10.2891 10.3475
10.3278 10.3294 10.2793 10.0385 10.0672 10.0302 9.9961 10.0179 9.9600
9.9648
12 : 12 : 1 12 : 2 12 : 3 12 : 4 12 : 5 12 : 25 12 : 30 12 : 35 12 :
40 12 : 45 12 : 50 12 : 56 12 : 57 12 : 58 12 : 59 13 : 13 : 1 13 : 2
39930.595749
10.0813 10.1108 10.1216 10.1149 10.1278 10.1781 10.3608 10.3285
10.3342 10.3517 10.2858 10.2802 10.1819 10.1658 10.1344 10.1629
10.1190 10.0838 10.0916

contact George Huxtable, at  george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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