AP in the east.

[Rdutton]

As an exercise please reduce and plot the following to check the different Ap formulas discussed above. In this case the daily running sun fix was within 2 miles of the DR positions.
17 Feb 2018    (UT)       12:18:50            13:40             15:32
DR Lat                          N38°09'             N38°02'          N37°54'
DR Long                       E15°38'              E15°37           E15°46'
HO HS corrected            37°35.5'             29°25.5'         110°21'


Bob,

Do you mean 11° 21'  or 10° 21'   ?


This is a very curious problem though it's probably easy once you understand it.

Please tell me if the following figures are correct

Sight at- 12:18:50 
GHA= 1° 12.8'
Ap longitude= E 015° 47.2'

Sight at- 13:40:00
GHA= 21° 30.4'
Ap longitude= E 015° 29.6'

Sight at- 15:32:00 
GHA= 49° 30.8'
Ap longitude= E 015° 29.5'

If these figures are right then I'll proceed with the LOP plots.

Thanks,

Roland