Natal Saturn 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 Saturn 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 Saturn : Radical changes in professional conditions and beginning of new ones is the key note of this transit. The native concentrates on material security, and a secured and meaningful place in the society. To achieve this the native may have a more conservative attitude in his business, professional and social affairs now. The native corrects his line of action from selfish point of view and tends to initiate into realistic new affairs of life. This is good transit for serious mathematical, scientific and shrewd political activities. If this is first cycle at the age around 28 or 29 then one prepares himself for adulthood responsibilities and if this is second cycle then one tries to attach himself to what is concrete and practical for his future life prospectus.
Transit Saturn Sextile Natal Saturn : Methodical and practical future planning is the key note of this transit. The native can enhance his worldly status and reputation through groups and organizational affiliations, friends or by entering into partnerships either marriage or business. The native is able to gain the favor of those in established professions or the older benefactors. In all it is favorable time to enter into new ventures. For established individuals this is the time to consolidate their business and professional gains.
Transit Saturn Square Natal Saturn : Tensions, crisis of confidence, anxiety, worry and fear of wrong decisions characterize this transit. The native feels frustrated, confused and insecure therefore, others create business and professional difficulties for him. The native is subjected to loss of work and labor problems. The native acquires the wrath of older persons and those in authority. The individual should avoid new agreements and also real estate dealings. The native may be subjected to certain restrictions from those in power and authority. The native may incur health problems involving bones, teeth, skin or accident by fall from height.
Transit Saturn Trine Natal Saturn : Planning and preparations for desired goals with honesty and integrity characterize this transit. The individual is engaged in serious and meaningful pursuits at this time with a balanced outlook to achieve his long range goals. The native is recognized for his hard work and past performances. The native gains the favor of those in authority. The native progresses by learning lessons from past failures or actions keeping in mind the bad times ahead.
Transit Saturn Opposition Natal Saturn : Conformity to traditional social norms and conservative business outlook characterize this transit. There may be obstructions imposed by co-workers and superiors. The native may be subject to despair and self doubt due to criticism associated with his good works even. Tensed relations may now be completely separated. This is the time when the native has to make himself aware of the need of cooperation in long range goals and ambitions. All this results in increased responsibility in business, professional and political fields. This period can be productive if the native leaves of now what is not working.