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Ca2500BC the spring equinox was in early April. Using Chris Marriott's SkyMap Pro11, like Siversten did, I found that ca2514BC (precision is not the same as accuracy, so 2000 or 2514 BC is largely irrelevant for astro-alignments so long ago unless obliquity of the ecliptic is taken into account and even that is less than 0.3 degrees) the Pleiades and the sun rose roughly at the same time in the morning sky. He suggests within about half an hour, much closer, perhaps within 20 minutes, as I calculate the rising. These astronomical objects were at about the same altitude in the sky seen from Twmbarlwm and so close, about 18 degrees horizontally, that the Pleiades could not have been visible in the dawn sky, swamped by sunlight, as they and the sun rose together.
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