The attached pictures show five successive examples of a family of Jupiter Saturn Neptune Venus conjunctions, separated by 179 year periods, in
53-4,
232-3,
411,
590 and
769 AD. The circled points show five near-exact SNV alignments. Venus meets Saturn and Neptune about a week after their 53 conjunction, and about a week before their 769 meeting. This very slow drift of only two weeks over the 716 year period illustrates that the VS, VN and SN periods are integer fractions of near-identical 179 year periods. The drift of the JS conjunction towards this stable SNV group is also clear in the illustrations. Data here is tropical and geocentric, but is readily available in sidereal and heliocentric formats as well.