Natal Rahu is the sign where your Rahu was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Rahu in Virgo, then your natal house is Virgo (Kanya Rasi) and during transit, SATURN forming conjunction (in Virgo), sextile (aspect of 60° which are Cancer and Scorpio in this case), square (aspect of 90° which are Gemini and Sagittarius here), trine (aspect of 120° which are Taurus and Capricorn here), opposition (aspect of 180° which is Pisces here) are discussed in this article.
Conjunction is transiting through same sign as in birth chart, sextile is transiting 3rd or 11th house, trine is transiting 5th or 9th house, opposition is transiting 7th house from natal sign.
Transit Saturn conjunct Natal Rahu : This transit characterizes conservative attitude towards current popular trends and beliefs. The native feels more secured under social conformity. The professional activities of the native are related to in some way are the other to the currently popular trends. The native may remain mentally depressed due to inner duel between the two contradictory factors in the personality at the same time. There may be anxiety, worry and financial troubles.
Transit Saturn conjunct Natal Ketu : The native is very critical of currently popular social trends and beliefs, and this is main characteristic of this transit. The native is unable to make best use of opportunities coming his way. Due to this attitude the native may be termed as a seclusive. The native may be so much involved in his professional duties that he is unable to enjoy the new things of the present society. The native does not want to take any professional risk. This is very unfortunate transit and destroys even good periods.
Transit Saturn Sextile Natal Rahu, Trine Natal Ketu : Recognition of endeavors characterizes this transit. The native has broad and serious outlook and works accordingly. The native advances his professional achievements in tune with the current popular trends and thus tends to gain personal security. The native is clever enough to take support of the conservative elements of the society though he identifies himself with the prevailing cultural attitudes. With this transit the native has ability to get his work done by arousing the sympathy of others towards him.
Transit Saturn Sextile Natal Ketu, Trine Natal Rahu : Though this transit has the same significance as the previous transit but the native is more inclined to take benefit from the current cultural trends, pretending at the same time to be more critical of the currently popular trends.
Transit Saturn Square Natal Rahu-Ketu : Non acceptance of the currently popular trends and beliefs characterize this transit. The native is more conservative now and is unable to identify himself with the popular cultural trends of the society which leads to loneliness, unpopularity and obstacles in business expansion. The native may be identified as an anti social element and his public reputation and relations get a set-back.