Saturn in the 12th for Cancer Ascendant

For a Cancer ascendant, Saturn rules the 7th house, Capricorn, and the 8th house, Aquarius. Saturn in the 12th sits in Gemini, because Gemini is twelfth from Cancer. The marriage lord and the longevity lord are both in the house of expense, foreign residence, sleep, and loss. Partnership and 8th-house themes tend to involve distance, cost, or a private life. Mercury rules Gemini and, for Cancer, also rules the 3rd and the 12th, so Mercury is the sign lord who has to host this Saturn.

Saturn in Gemini is in a friend's sign, because Mercury and Saturn are friends. The sign is tolerable. The houses Saturn rules are the problem, not a debilitation. Saturn's debilitation is Aries.

Saturn mahadasha lasts 19 years and will spend this lordship: marriage topics and 8th-house topics routed through the 12th. That can be a spouse from another place, a marriage that costs, or a long period of duty away from home. It can also be solitude that is chosen. The 7th house itself, Capricorn, may be empty. The lord being in the 12th is enough to send the topic outward.

Venus, for Cancer, rules the 4th and the 11th. Comfort and gains are Venus's, not this Saturn's. A strong Venus does not cancel Saturn's 12th-house job. It gives other houses a different lord.

Mars is yogakaraka for Cancer, ruling the 5th and the 10th. Mars is not the marriage lord here. If someone remedies marriage by strengthening Mars, they are feeding career and children, not the 7th. The 7th lord is Saturn. Blue sapphire would strengthen that 7th-and-8th lord in the 12th, which is a serious step, not a casual fix, and it does not move Saturn into the 7th.

Read Saturn in the Navamsa. A Saturn fallen in the D9 makes the 19 years thinner. A Saturn dignified in the D9 makes the foreign or costly marriage more capable of lasting.