NavList:

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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