Courtsey Vedic Vision.

Keerthi karma yoga = Sun + Saturn = in yogavor trine or mutual aspect  (these written below generic observations for predictions always rely on holistic chart reading)  

Saturn and Sun, both are father son duo,

which father hates his son? 

None

Father always want son to do things which make him proud for that reason he try to push his son hard even though he doesn't like it or not this desire of father create struggle in their bond, so is case of Saturn and sun, but even with all this fiction points father will ponder over son situation ask about his whereabouts and keep an eyes on him this is how sun saturn also play out in horoscope 

Sun is primal source of energy, stand for activity and robustness, sun is aatmakarak IT show what our soul want to manifest in our life and his son is saturn karak of karma, activities done by sun create karma who's saturn 

We can judge this combo in following 5 planes manner 

1. Effect on physical body - sun is heart and eyes, Saturn gives dim eyes, black spot under eyes, heart systen should be checked well in every check up, Saturn is air element when with sun plain in bones and acidity problem 

2. Effect on relationships - sun is natural father and Saturn elder brother, native will have generational gap related misunderstanding with father and ego problems with elder sibling, relationship improve once Saturn maturity age 

3. Effect on karma creation - Saturn is karma and sun is king /government, this combo makes native very cautious, native fear their reputation will be ruined by enemy hence they trend cautiously for every work so that no one would be able to accuse them of wrongdoing, they are slow but stable, native does well in administration specially gov (typical babudom nature of doing work)  politic suit them 

4. Effect on spiritual aspect - native believe karma is dharma, doing  seva and good karma is way to reach God 

5. Effect on finance - native get income from doing administration, if sun is ahead by degree native is known for great karma and well good status specially if sun strong and if weak we struggle for name and fame 

If Saturn is strong then native father had done social work and got fame, native struggle to get out of shadow of father 

So this combo have good and bad effect we should all aspects patiently but remember this combo without strong sun in horoscope (seed of Saturn)  we cannot be well known and Saturn cannot give his full result

 now best thing to happen in this combo is when sun and Saturn are 7th to each other this empower Saturn and give fame for work in later part of career.