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At 12:12am on 21 September 2360, from atop a 400-foot-tall tree on Calderon Beta, one could see more stars in the sky than at any other point in history. According to the Eleventh Doctor, it was "like daylight, only magic". The Doctor took River Song there on their first date following her imprisonment in Stormcage. (TV: First Night)
Later in her personal timeline, River was chased across the galaxy by Sontarans to this point in time and space, and entered the Doctor's TARDIS. She called the Doctor a "nostalgic idiot" for returning to Calderon Beta, not knowing that he was at that time on their first date, not just returning to the location. An older Eleventh Doctor collected his River and brought her to Darillium, and the younger pair exited the TARDIS to experience the wonder they'd come for. (TV: Last Night)