Natal Pluto is the sign where your Pluto was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Pluto in Sagittarius, then your natal house is Sagittarius (Dhanus Rasi) and during transit, SATURN forming conjunction (in Sagittarius), sextile (aspect of 60° which are Libra and Aquarius in this case), square (aspect of 90° which are Pisces and Virgo here), trine (aspect of 120° which are Aries and Leo here), opposition (aspect of 180° which is Gemini 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 Pluto : Heavy professional burden and structural changes in life are the key notes of this transit. This transit gives impetus to the will power to achieve one’s goals. The native tries to end old conditions in professional arena and begins new ones vigorously for the improvement of work efficiency. The native is keenly interested in meditation and spiritual practices. Those engaged in scientific and technological fields achieve something new through clairvoyant faculties now. If this condition is afflicted then there is danger of serious illness or death in some cases.
Transit Saturn Sextile Natal Pluto : Increased mental concentration and discipline characterize this transit. The native may excel in occult, scientific and mathematical pursuits by the aid of his institution and insight. The native may be trusted for professional secrecy.
Transit Saturn Square Natal Pluto : Unrest and frustration are characteristic of this transit. The native is subject to hard and unsympathetic attitudes. The native’s power struggle and progress hinders due to dishonest, corrupt and conspiring people. If the native resorts to dishonorable means then he may ruin his career and reputation. This transit indicates unsatisfactory sexual performance. The native is subject to troubles regarding corporate money, joint finances, inheritances, insurances etc.
Transit Saturn Trine Natal Pluto : Realization of ambition by hard work and concentration characterize this transit. The native advances professionally in an effective way. The native makes an impact on others to help him in accomplishing his projects. The native is full of insight and can excel in meditation, spiritualism and scientific exploration. The native has a desire to reform the existing power structure as he believes in the principle of justice and works usually for the cause of down trodden. A very good transit for trade union leaders to do something worth while for the labor classes.
Transit Saturn Opposition Natal Pluto : Coercion and hard success are the key notes of this transit. Power greedy and dishonest people try to disrupt the native in every possible way. The native should refrain from using economic power and authority for the advancement of his own interests as it may damage his reputation in the long run. This transit demands hard work and fair approach to achieve desired goals and any short cuts to achieve power and status will bring disaster to the native under this transit.