Saturn, because it is at the greatest distance from the sun of all the visible planets, has the longest "year," taking a little less than 30 years to complete one circuit of the zodiac.
This makes it the best precessional timekeeper of all the planets.

Saturn completes one precessional Great Year of 25,920 years every 864 of its "years," a half cycle every 432 of its "years," a quarter cycle every 216 of its "years," and an eighth of a cycle every 108 of its "years."
This equals (108 x 30) 3240 years, or 45 degrees of precessional arc.

We can continue counting in Saturn years down to 9, one 96th of the precessional year, or 3.75 degrees of arc and 270 earth years, which brings us to the alignment period of the galactic meridian and the zenith/nadir axis.

If we note when Saturn fell on a significant marker, such as the galactic center or antipode, then we can simply count Saturn cycles to mark the span of the Great Precessional Year.
In this way, we could determine that if Saturn fell on the galactic antipode and made a station (since the earth is moving faster than Saturn, it appears as if it is overtaken, making it appear to stand still in the sky to mark the moment), then 432 Saturn cycles ago it was making a station at the same location, and would be doing so again at the completion of 864 Saturn cycles.

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