Manzil		Begins on	Number of days		Stars
20	Al Na'am, The Ostriches	16 Jan (381)	13	257	Ascella & Nunki (ζ, ς Sagittarii)	287.9, 288.4
21	Al Baldah, The City	29 Jan (394)	13	270	Al Baldah (π Sagittarii)	290.1
22	Al Sa'ad al Dabih, The Fortune of the Slayers	11 Febr (407)	15	285	Dabih (β Capricorni)	308.1
23	Al Sa'ad al Bula, The Fortune of the Swallower	26 Febr (422)	13	298	Albali (ε Aquarii)	314.8
24	Al Sa'ad al Su'ud, The Fortune of the Fortunate	11 March (435)	13	311	Sadalsud (β Aquarii)	325.9
25	Al Sa'ad al Ahbiyah, The Fortune of the Hidden	24 March (448)	13	324	Sadachbia (γ Aquarii)	338.6
26	Al Fargh al Mukdim, The First Spout	6 April (461)	13	337	21°25'40" Aquarius
27	Al Fargh al Thani, The Second Spout	19 April (474)	13	350	4°17'09" Pisces
28	Al Batn al Hut, The Belly of the Fish	2 May (487)	15	365	17°08'34" Pisces

In the days of Ibn 'Arab the RA dates would have been earlier than those in my table above, where they are approximations of those in rongorongo times.

Ibn 'Arab has the position 8°34'17" Aquarius for Sadachbia (γ Aquarii) and from there we can count:

21°25'40" - 8°34'17" = 21.428º - 8.571º = 12.857º, or approximately 13 days.

338.6 (Sadachbia) + 12.857º / 360º * 365¼ = 351.6 = 13.0 + 338.6.

The best numerical fit is φ Aquarii (352.0) and this is also the star closest to the ecliptic of the 3 possible alternatives:

*Markab Pegasi*	α Pegasi	2.49	14° 56′ N	23h 02m	350.5	ACH
	π Cephei	4.41	75° 23′ N	23h 06m	351.6
	φ Aquarii	4.22	06° 03′ S	23h 12m	353.0
	ψ Aquarii	4.24	09° 05′ S	23h 13m	353.4
	χ Aquarii	4.93	07° 44′ S	23h 14m	353.6
	γ Tucanae	3.99	58° 14′ S	23h 15m	353.8
	ο Cephei	4.75	68° 07′ N	23h 17m	354.3
*Kerb*	τ Pegasi	4.58	23° 28′ N	23h 18m	354.6

The First Spout, Al Fargh al Mukdim, was probably ruled by φ Aquarii: