Celestial Nav problem I can't solve

[RayCam]

Hi Clen,

Thanks so much for taking the time to look at this. Well, you've fixed my first mistake about I handle time, so that gets me the correct Zn now at 122.7, but I'm a little out on the intercept distance.  My workings are

but I have have a different calc as follows

Hs          = 13° 39.4'
I.           =       +2.3
Dip         =       -7.6
Ha          = 13° 34.1'

Alt Corr   =     +12.4
Ho          =13° 46.5'  (You have a Ho of 13° 41.9' )

CCT =  21:09:50 on the 15th Jan (the day before)?  I think you've used 16th Jan

GHA             = 132° 35.6'
+min & Sec.  =    2° 27.5'
GHA             = 135° 03.1

DR Long       = 163°  51 E
Ass Long      =  163° 56.9 E

LHA              = 299°

Dec             = S  21°  02.2
d                 =           - 0.1
Dec             = S  21°  02.1

Ass Lat        = 27° N

Hc        = 13°  55.3
corr.     =        - 1.3
Hc        = 13°  54.0

Intercept (a) = 7.4 away. (question says it should be 8.3)

Zn = 122.7

If the Zn in the answer is the same, then I'd imagine there is no error in their calculations, so I've made an error somewhere.  I just can't work out where.

Maybe you can spot it?  We had calculated different Ho

Thanks

Ray