Sephiroth is -by far- not a regular at the Observatory. On the handful of occasions he graced the old stronghold with his presence it had been undertaking some extension of his work. Whether it be to discuss some things with Ashelia before she had slipped away, or something to do with Mograma's supervision.
However, upon return from the expedition to the Mysidian Tower, Sephiroth sought out the archives that were stored; to refresh mostly what they knew -as a collective- about the Ancients. It had never been a topic that had been particularly high on his 'need to know' list but he figured refreshing his knowledge with what others had reported might help his own report on the Tower they had visited; by lending a little more context.
It was noticing more moogles flitting around inside the building that urged Spencer, ever at his side, to inquire why. Not so very long afterward, had Sephiroth at one of the doorways to a room Zelda were rearranging; just watching her from the doorway for a moment as she tried to move a closet that had to be entirely too heavy for her to do on her own.
Old Observatory -- after they return to Aqures; 12th Feb
However, upon return from the expedition to the Mysidian Tower, Sephiroth sought out the archives that were stored; to refresh mostly what they knew -as a collective- about the Ancients. It had never been a topic that had been particularly high on his 'need to know' list but he figured refreshing his knowledge with what others had reported might help his own report on the Tower they had visited; by lending a little more context.
It was noticing more moogles flitting around inside the building that urged Spencer, ever at his side, to inquire why. Not so very long afterward, had Sephiroth at one of the doorways to a room Zelda were rearranging; just watching her from the doorway for a moment as she tried to move a closet that had to be entirely too heavy for her to do on her own.