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East China Sea Fix
From: Jeremy C
Date: 2008 Nov 13, 04:37 EST
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From: Jeremy C
Date: 2008 Nov 13, 04:37 EST
Here is a daylight planet fix. Unfortunately the sun was obscured by
clouds to preclude a three-body fix.
Date/Time 19 October 2008 UTC 08h 41m 00s
0841Z Fix Lat: 26 deg 53.5' N Long 129 deg 37.8' E
Course 310 at 13.1 knots.
Height of eye is 107 feet, Index error is 0.7' on the arc, T/P 80 deg F at
1010 mB.
Venus was shot at UTC 08h 35m 48s with an Hs of 22 deg 54.4'
Jupiter was shot as an ex-meridian at UTC 08h 39m 48s with an Hs of 40 deg
22.9'
---------------------------------
My manual ex meridian calculations gave me a latitude of 26 deg 52.5' N at
0840Z (see below for solution)
My computer gave me a 0841Z fix of 26 deg 52.8' N; long 129 deg 39.3' E by
reducing both as standard LOP's.
-----------------------------------
ex-meridian calculations:
GHA hr 221 deg 43.0'
t corr 9 deg 57.0'
v corr
(2.1) +1.4'
-------------------------------
GHA 231 deg 41.4
+Long 129 deg 37.8
-------------------------------
LHA 1 deg 19.2'
"a" correction is 2.1 c= a(t^2)/60 = 2.1(5.3^2)/60= 0.98 = 1.0
[these corrections can be found in Bowditch tables etc]
Dec is S 22 deg 55.3' [ from Nautical Almanac, no correction due to
time]
Hs 40 deg 22.9'
IC -0.7'
Dip
-9.9'
-----------------------
Ha 40 deg 12.3'
body -1.1'
-----------------------
Ho 40 deg 11.2
corr +1.0
----------------------
Ho' 40 deg 12.2
Zdis = 90-Ho' = 49 deg 47.8'
Dec -
22 deg 55.3' [Declination is opposite of Latitude and is therefore
subtracted]
-----------------------------------------
Lat
26 deg 52.5' North
Jeremy
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