What is the effect of Sani Mahadasha and Rahu Antardasha in a horoscope with Gemini as ascendant?

For Gemini (Mithun) ascendant, Saturn (Shani) becomes the lord of the 8th house (Ashtamesh) and the lord of the 9th house (Navamesh); he becomes the ruler of the 8th and 9th houses. Saturn is the significator of action (karma), love for justice, deep study, delay, longevity, etc., whereas Rahu is the significator of illusion, ambition, foreign lands, sudden changes, foreign languages, poison, and such things.

Depending on the position of Saturn and Rahu in the birth chart, a person can receive positive or negative outcomes. Looking at the positive outcomes, new avenues open up for financial progress in the person's life, social prestige increases, opportunities become available for work related to multinational companies, and there is progress in the field of work; whereas due to negative outcomes, sudden changes are possible in jobs and business, along with mental illusion and anxiety about the future, family differences, health problems, and mental agony due to wrong financial decisions.

For a Gemini ascendant, the 8th and 9th houses become active during Saturn's Mahadasha, because of which transitional changes are observed in life, and a new beginning takes place; meanwhile, Rahu Antardasha nurtures the ambition within the person. If Rahu is auspicious, outcomes such as sudden success, gains from foreign lands or due to a change of place, work related to foreign companies, etc., are observed.

A while ago, I came across Astrochitra and appreciated how they explain planetary periods from both a practical and karmic perspective.