The Big Dipper?

Lord Taira no Masakado PART 6.
Following the legend, we visited Masakado (Kubi) Mound, Kabuto Shrine, and Tsukido Shrine. There is a theory that adding four other sites and plotting them on a map forms the Big Dipper. According to "Did Taira no Masakado Become a God?" (Nanami Kamon, 1993), the seven sites are: ① Torigoe Shrine (Taito Ward), ② Kabuto Shrine, ③ Masakado Mound, ④ Kanda Myojin Shrine, ⑤ Chikudo Hachiman Shrine (Shinjuku Ward), ⑥ Mizuinari Shrine (same ward), and ⑦ Yoroi Shrine (same) = photo. Kabuto Shrine, Masakado Mound, and Kanda Myojin Shrine, which enshrines Lord Masakado, are convincing enough. Yoroi Shrine, too, notes on its official website that there is a legend that when Lord Masakado was slain, local people mourned his death and buried his armor.
The others are a bit questionable. The author says Torigoe Shrine takes its name from Masakado's head "flying over" this spot, and that at Mizuinari Shrine, Minamoto no Tsunekata (vice commander of the force that suppressed Masakado) destroyed Masakado by divine oracle from Inari—but neither claim is well substantiated. Chikudo Hachiman Shrine has no official link to Lord Masakado, and conversely Tsukido Shrine (said to enshrine his head), introduced earlier, is not among the seven. The author calls this "the biggest weakness," yet emphasizes that Tsukido Shrine stood near Chikudo Hachiman in the Edo period and placed the latter on the map. He further speculates that the ladle-shaped Big Dipper layout was "a shogunate device to keep spiritual power from leaking outside Edo alone."
British author Graham Hancock's "Fingerprints of the Gods" came briefly to mind. The mysteries linking pyramids, astronomy, and mathematics were quite thrilling—but what of Masakado and the Big Dipper?