Well, lets put it this way. Consider Capricorn as a town which has many areas(nakshatras) located in the town. This town is governed by Saturn who lays the rules eventhough his native town is aquarius. Here, one of the areas is owned by Sun which is the nakshatra 'Uttarashadha'.This means Sun owns a land in Saturn's (his enemy's) town.
Basically, even if Sun is Saturn's enemy, he has to follow the rules set by Saturn since the town's mayor cum owner is Saturn. Also, saturn is allowed inside Sun's land even though Sun may not like it and he cannot do anything to Saturn as long as he is in the pada of Uttarashadha which is inside the township of Capricorn.
Now, if Sun is in Capricorn in his own land 'Uttarashadha' , he will feel comfortable as long as he is inside his borderline. Saturn cannot do anything to Sun as he is protected 24/7 in his own land!
Now, if Saturn(even though the owner of the town) enters Uttarashadha, he is safe but follows the customs that are being followed by Sun since he is a guest at Sun's place. These customs can be identified by the placement of Sun in the Rasi chart.
But the situation is different if Saturn is in Leo. Sun has full dominance even if Saturn is in Purva Phalguni(Venus's land in Sun's township). Eventhough Saturn is a dear friend to Venus, Venus cannot hide Saturn forever in her home since she herself is an enemy to the Sun. So, Venus may feel safe in Purva Phalguni, but not Saturn.
Lets say, if Saturn has an option to visit Leo, he has the 3 destinations. Magha can be compared to a high security Prison; Purva phalguni can be compared to a hut without any safety; Uttara Phalguni(1st pada) can be compared to hell for Saturn where he will be tortured 24/7..
Hope you get the idea
Regards,
Moksha Line




