Navamsha lagna is called "swamsha" because it represents "the portion of the soul". The D-9 is a highly spiritualized varga which provides a map of the astral personality. The astral self is composed of subconscious memory banks which store information from all lives past, present, and future.
Astral images are perceptible in dreams and psychic vision, but they have not yet assumed material form.
In addition to other predictive and defining functions, the navamsha indicates the overall architecture of one's next life. The navamsha is also a primary indicator of marriage partnership. Thus the dictum, one will become one's spouse in the next life!
When gochara Ketu crosses the threshold of navamsha ascendant, some of the normal boundaries between the conscious personality and the subconscious memory banks are dissolved. Because Mithuna hosts the human mental communication functions, relationship communication may become vague or erratic when Ketu transits the Mithuna D-9 lagna.
In marriage-type unions, the native behaves with detachment and even disregard for the reality of the partner. One may prefer to engage with the inner spiritual perceptions leaving the day-to-day participation in relationship for a later time.
If the relationship is not yet stabilized by a religious vow or some variety of material bondage, the native's uncertainty about the value of partner communication may cause withdrawal or even abandonment of the union. Issues of language, meaning, and content of daily conversation are especially exhausting, and may lead to disconnection.
If the union is fixed, or if the primary partner is a deity, non-verbal perceptions of the native in Witness or Observer mode can increase the sensitivity of communications and ultimately enrich the understanding of the relationship dynamic. However during the transit one may feel rather numb and lack motivation to plan, schedule, or publish information within or about the union.
