Sulla Wikia di MlP è apparso finalmente un riassunto che riguarda l'ultimo libro "The Journal of the Two Sisters", dove riassumono la storia di Luna e Celestia. Ecco qui:
http://mlp.wikia.com/wiki/Princess_Cele ... wo_Sisters
Celestia and Luna were asked by Star Swirl the Bearded to become Princesses of Equestria to help unite the three tribes as they represented all three as Alicorns. It turns out, when they were younger, the sisters always dreamed of becoming Princesses. Although they accepted, the sisters were still blank flanks, not only due to Alicorns aging differently from other ponies, but also due to duties of the sun and moon still being under the control of King Bullion and Princess Platinum's Unicorns.
During their time as Princesses before gaining their cutie marks, Celestia felt a sense of attachment to the sun carving on the Tree of Harmony, deciding to build the Castle of the Two Sisters nearby with Star Swirl's full support. Celestia, or Celie, as Luna nicknamed her, was puzzled by Luna's request for all the trap doors and the Organ to the Outside, but agreed when Luna offered to include the secret reading room for Celestia in the library. Thanks to Luna befriending a manticore named Melvin, along with Cragadiles, bats, and owls, Celestia nearly had the castle completed, now knowing she and Luna were meant to rule together.
Once the castle is finished, the Princesses are introduced to Unicorn King Bullion and Princess Platinum by Star Swirl personally. King Bullion was very friendly, but Platinum was very rude, even going so far as to insult Celestia for being their sovereign without a cutie mark. Luna fixed Platinum's behavior using the Organ, and Platinum made amends by having the Unicorn seamstresses fill the Castle with beautiful tapestries of the new Royal Sisters, including designing the new seal for the Equestria flag. After that, the second-in-commands for the three tribes met with Celestia to reveal all the new progress the tribes were making since Celestia and Luna's coronation, displaying the new sense of peace and harmony the sisters had brought to Equestria. Star Swirl even invited Celestia to see his library, offering her the chance to study up on everything involving the three tribes that she had never seen before, and she happily accepted. Star Swirl even lets Celestia know of some spells he is practicing on that are still in development, and assist him in perfecting his spell to travel through time and space without limitations.
Celestia also was introduced to Zecora's kind when she went looking for Luna and found her on the outskrits of where the zebras resided.
Celestia soon found herself trying to broker a new peace treaty with the griffons when they chose to renew their feud with Commander Hurricane and the Pegasi after learning of the change of authority in Equestria. The griffon leader, Gregor, refused to negotiate with her until she and Luna brought him his favorite eclairs, and Luna baffled him into silence with the rhyming she learned from the zebras. She also found herself having to retrieve the Crystal Heart for the Crystal Empire's sovereign, Unicorn Princess Amore, when it is taken by a dragon who reclaimed it under the pretense that it was mined from his keep and thus is his property. When the dragon disrespects her too much, Celestia unleashes her own Royal Canterlot Voice on the dragon in fury, spooking him so badly that he returns the Heart and flees into his keep, never to bother anyone again, and showing how one should never enrage Celestia.
One night, Celestia awakens to find Star Swirl exhausted and looking older than he should, revealing that he had run out of full-grown Unicorns to help lower the moon and raise the sun. He had tried to do it alone, but used up his own Unicorn magic in the process. Realizing that Alicorn magic is more powerful than Unicorn magic, Star Swirl asked Celestia and Luna to assume the duties of being guardians of the sun and moon, believing that by doing so, their magic would actually become stronger as the sun and moon would rejuvenate them. Celestia and Luna took flight and performed the sunrise and setting of the moon flawlessly. When it was over, Celestia finds she has earned her sun cutie mark while Luna has earned her crescent moon cutie mark. Remembering that her cutie mark looks just like the carving on the Tree of Harmony, she then asks about the third one, but Star Swirl leaves her to find out for herself.
Celestia's final entry states that she and Luna have entered a new stage in their lives now that they have their Cutie Marks, and hopes that more exciting adventures are to come for her and Luna.
Allora Starwirls viaggiava nel tempo, Celestia lo ha aiutato in vari incantesimi, e sapeva di Twilight Sparkle (Cadence mi sembra un caso a parte, essendo stata messa al Crystal Empire). Ma come faceva a saperlo?
Magari si incontrano nella S5 con un viaggio nel tempo? Pare che abbia trovato successivamente un modo per fare viaggi senza limiti, dunque potrebbe essere...
Precoci le principessine, volevano già avere le ali e ancora avevano il fianco bello lindo Ammetto che mi aspettavo però che bene o male avessero preso il controllo degli astri da parte degli Unicorni e in quel modo avessero preso il cutiemark .
Comunque c'è qualcosa di strano: l'inizio dice che le due avevano sempre voluto essere Alicorni da giovani, ma allo stesso tempo che Starwirls gli ha dato il compito perché loro, essendo Alicorni, rappresentavano le tre tribù. Dunque lo sono diventate anch'esse in seguito?
Inoltre viene confermata una idea che in precedenza scansavano: gli Alicorni invecchiano davvero molto più lentamente degli altri ponies . Dunque che Twilight Sparkle sorpassi in vecchiaia le altre sue amiche è canone anche questo, a meno che alla fine della serie non lo diventino pure loro. Non viene specificato se siano immortali, ma "aging" significa invecchiare, perciò sarei più dell'idea che la loro età si misuri in secoli o millenni, ma abbia un termine. Forse i 1000 anni e oltre di Celestia equivalgono ad un "40" in termini umani o di Ponies.