NavList:

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From: "antoine.m.couette@club-internet.fr" <antoine.m.couette@club-internet.fr>
To: NavList@fer3.com
Sent: Monday, September 21, 2009 2:34:24 AM
Subject: [NavList 9834] Re: IN HONOR OF JEREMY TWO STARS FULL LAN's : ONE UPPER and ONE LOWER CULMINATION

RIGIL KENT

Transit time at 09h17m52.3s (R KENT exactly south of moving vessel)

Position at 09:30.0 UT is S4815.7W01709.4 while we had an other independent FIX off 1.4 NM from Astronomical FIX. Our confidence for this Astronomical Fix was a Latitude error of 0.3' and a Longitude error of 3.8' (3 SIGMA values).

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Hello Antoine,

For this example my rapid-fire program gives the same fix as yours:

S   48 deg 15.7'  +/- 0.1'
W  17 deg 09.4'  +/- 3.1'

and are followed by 1-sigma standard deviations.

As before, I used my meridian-transit fix for AP.  I also send the the input data file (Toward = positive, Away = negative).  The Ho's are entered in decimal form, hence the arcminutes' column data are set to zero throughout.


Peter Hakel



Time of fix (UT hours, minutes, seconds):
9 30 0

Assumed position:
Latitude (degrees, minutes)
 -48 -15.7
Longitude (degrees, minutes)
 -17  -8.8

Course (degrees, true)
68.5

Speed (knots):
20.2

Number of observations:
15

UT           Ho         Intercept Azimuth
 h m  s      d  m       nm (T=+)  d (true)
 8 15 00     19.965 0  +12.5      188.1
 8 30 00     19.603 0   +9.3      186.1
 8 42 00     19.378 0   +7.1      184.6
 8 55 01     19.200 0   +4.9      182.9
 8 59 34     19.153 0   +4.2      182.3
 9 03 12     19.122 0   +3.6      181.8
 9 12 42     19.063 0   +2.1      180.6
 9 17 53     19.047 0   +1.4      180.0
 9 23 47     19.042 0   +0.7      179.2
 9 26 24     19.043 0   +0.3      178.8
 9 30 00     19.052 0   -0.1      178.4
 9 45 00     19.140 0   -1.6      176.4
10 00 00     19.317 0   -2.8      174.5
10 15 00     19.583 0   -3.8      172.6
10 30 00     19.940 0   -4.2      170.7