The constellation Ophiuchus bears on a time frame:

The equinoxes and the solstices form a cross in the sky Every 6500 years, either the equinoxes or the solstices are aligned with the equator of our Galaxy. ...This is also the time of the completion of the 6000-year long Jewish/Biblical calendar cycle.

Since the late 1930s, all the planets have astrologically passed through Ophiuchus' area of the sky. All but one ... Pluto began its journey through Ophiuchus and the Serpent around the start of the 1990s. ... Pluto will complete its journey through Ophiuchus around 2012.

[link to www.slivoski.com]

(Hope the link is still good.)
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