As if by chance the King of Spain happened to take command over Easter Island approximately 71 (= 26000 / 365) years before my assumed date for rongorongo (1842 A.D.):

... On the following day, 20 November 1770, Commander José Bustillo took formal possession of Easter Island 'in the name of the King and of Spain, our Lord and Master Don Carlos the third', renaming the island 'San Carlos'. Several hundred Rapanui - probably members of the Koro 'o 'Orongo tribe of the eastern 'Otu 'Iti - observed the ceremony not far from Poike's parasitic cones Parehe, Teatea, and Vai 'a Heva, on the tops of which the Spaniards had planted three crosses. Following three boisterous 'Viva el Rey!' for each cross, the land party let off three salvos of musketry, whereupon the two Spanish vessels San Lorenzo and Santa Rosalia responded with 21 cannon salutes. 

Spain's foremost historian of the Pacific, Francisco Mellén Blanco, has written of the event: 'The spectacle must have been awe-inspiring for the islanders. The parade of uniformed soldiers; the fluttering flags; the chaplains in their surplices chanting out the litany; the beating of drums, and the trilling of fifes must have left a lasting impression on all the natives who witnessed the procession' ...

The 3 crosses erected for Carlos III high up on Poike (Place Aloft) could easily have been contrasted with the single great cross low down in the south, which always was used in the nights as a time-piece and which around that time happened to be at the Full Moon when the Sun was at the northern spring equinox.

... The Candelabra was intended by its designers to be seen from the north. Indeed, there is no other perspective from which it may be satisfactorily viewed: the observer must face south towards the sloping escarpment on which it is carved. Examining the diagram from the base up naturally draws the eyes towards the southern sky above the escarpment, and specifically towards the south meridian. Although it may be entirely coincidental, computer simulations tell us that at around the hour of midnight on the March equinox 2000 years ago - the epoch in which the Candelabra was probably made - the constellation known as Crux (the Southern Cross) would have been seen lying on the south meridian at an altitude of 52 degrees ...

The sign of 3 crosses could have been interpreted as 'up in the north', we can guess. And not only did the new rulers rename the island San Carlos but they also introduced the Gregorian calendar, created for observations north of the equator. The 'birth' of this north of the equator originating world could therefore have been dated to 1770 A.D. Or better, to the following year which was like a mirror 17-71.

... At Opoa, at one of the last great gatherings of the Hau-pahu-nui, for idolatrous worship, before the arrival of European ships, a strange thing happened during our [the two priests of Porapora, Auna-iti and Vai-au] solemn festivity. Just at the close of the pa'i-atua ceremony, there came a whirlwind which plucked off the head of a tall spreading tamanu tree, named Paruru-mata'i-i-'a'ana (Screen-from-wind-of-aggravating-crime), leaving the bare trunk standing. This was very remarkable, as tamanu wood is very hard and close-grained. Awe struck the hearts of all present. The representatives of each people looked at those of the other in silence for some time, until at last a priest of Opoa named Vaità (Smitten-water) exclaimed, - E homa, eaha ta 'outou e feruri nei? (Friends, upon what are you meditating?) - Te feruri nei i te tapa'o o teie ra'au i motu nei; a'ita te ra'au nei i motu mai te po au'iu'i mai. (We are wondering what the breaking of this tree may be ominous of; such a thing has not happened to our trees from the remotest age), the people replied. Then Vaità feeling inspired proceeded to tell the meaning of this strange event… I see before me the meaning of this strange event! There are coming the glorious children of the Trunk (God), who will see these trees here, in Taputapuatea. In person, they differ from us, yet they are the same as we, from the Trunk, and they will possess this land. There will be an end to our present customs, and the sacred birds of sea and land will come to mourn over what this tree that is severed teaches. This unexpected speech amazed the people and sages, and we enquired where such people were to be found. Te haere mai nei na ni'a i te ho'e pahi ama 'ore. (They are coming on a ship without an outrigger), was Vaitàs reply. Then in order to illustrate the subject, Vaità, seeing a large umete (wooden trough) at hand, asked the king to send some men with it and place it balanced with stones in the sea, which was quickly done, and there the umete sat upon the waves with no signs of upsetting amid the applauding shouts of the people ... (Teuira Henry, Ancient Tahiti.)

My assumed date for the rongorongo star structure - as mapped by right ascension days - has a precessional depth of ca 4 days down to the time of Gregory XIII, whereas the star positions in 1771 A.D. could have been 'frozen in time' at the precessional depth of 3 days, corresponding to the distance down to the time of Gregory XIII:

I think this is a reasonable explanation for why the stars were positioned as they were in the C text.

In A.D. 1771 Acrux happened to be close to the Full Moon in day 81 according to the Gregorian calendar.

... Take the lower part of a gourd or hula drum, rounded as a wheel (globe), on which several lines are to be marked and burned in, as described hereafter. These lines are called na alanui o na hoku hookele, the highways of the navigation stars, which stars are also called na hoku ai-aina, the stars which rule the land. Stars lying outside these three lines are called na hoku a ka lewa, foreign, strange, or outside stars. The first line is drawn from Hoku-paa, the fixed or North Star, to the most southerly star of Newe, the Southern Cross ...