I recall seeing reports about Chandra seeing X-ray echoes from gas clouds near Sgr. A[star]. Maybe hundreds of years ago, and 10^6 times brighter. Do we have o

I recall seeing reports about Chandra seeing X-ray echoes from gas clouds near Sgr. A[star]. Maybe hundreds of years ago, and 10^6 times brighter. Do we have other data like that? How far back does our record of Sgr. A[star]'s light curve extend? Also, I gather that Sgr. A[star]'s rotational axis isn't normal to the mean galactic plane. And I presume that the axis precesses. Does it ever point near enough to the Sun to cause damage? Edit: typo