Steve, in the context of SY's equinoctial precession model Frawley's word can make sense, although it is too vague and generic and not at all substantiated when he speaks about the light from the galactic center and the hypotheses of some (unspecified) astronomers:
Besides the light from our own Sun, we also receive light from the center of the galaxy, the galactic Sun. Much of the light of this greater"Sun, however, is not in visible frequencies. Some astronomers have suspected a central galactic light, like that of a quasar, whose light may be obscured by dust or nebulae in the region of the galactic center. According to Vedic astrology, the light from this galactic source has a special influence upon Earth.
But, although the center of our galaxy is supposed to be a black hole, sagittarius A*, it is not a quasar according to astromomy. Quasaras by the way are extremely luminous objects. Our galaxy may become a quasar if the milky way is going to collide with Andromeda in the remote future.