Sun In Capricorn Sign
1) Before knowing the effect of Sun in Capricorn Sign we have to know about Sun the boss and Capricorn Sign. Capricorn Sign is 10th house sign of kalpurush so you may read Sun in 10th house. Sun is 5th house lord of kalpurush and it is placed in 10th house of kalpurush so you may read 5th house lord in 10th house. Capricorn Sign lord is Saturn which is enemy of Sun and Sun is also enmity with Capricorn Sign lord Saturn. So regarding friendship wise it is not consider good to Sun placed in a enemy sign.
2)Let’s we know from different classical book about Sun in Capricorn Sign
When Sun in Capricorn Sign in birthchart Native will be mean(नीच), idiot(अज्ञ), lower grade or lower class article seller (कुवणिक), having little wealth (अल्पधनवान), greedy(लुब्ध), and lives on others fortune (अन्य भाग्यै रतः).
When Sun in Capricorn Sign in birthchart then native will mean man and interested in bad women. Native will be greedy and always active for mean type jobs. Native will be endowed with various deeds. Native will be timid and devoid of relatives and will lose everything due to dispute with his relatives. Native will be weak, having fickle minded, fond of wandering and voracious eater.
The Sun in Capricorn sign in birthchart native will lost his morality. Native will be delights in many occupations but has little strength. Native will lost his property due to conflicts with his allies. Native will be greedy and addicted to sexual intercourse with bad women. Native’s income is increased by crime. Native may be suffering from heart trouble and wandering so much. Native will be bereft from dharma and critisizer of good men.
कुवणिक् क्रियासु कुशलः
Native will be skillful regarding petty trading.
3)According to our tradition when Sun enters in Capricorn sign we are celebrate this with different name because it is mythic that we celebrate victory of devs over danavs. So mythological it is auspicious time when Sun in Capricorn. But regarding astrologically Sun in Capricorn sign indicating Sun is placed in a enemy sign also Capricorn lord Saturn has enemity with Sun.
4)Sun is a karak of personality so Sun in Capricorn indicating a orthodox type native who may be selfish by personality. A sattvic planet Sun doesn’t feel happy in a tamsic sign Capricorn which lord is also enemy of Sun. So native may not have good morality and may be involving in base or neech type activity. Native don’t have a good self-respect.
5) Most of sage suggested Sun in Capricorn may cause conflicts with relatives, may be its due to Sun aspects on Cancer Sign from his enemy sign or in other words a afflicted Sun aspects on Cancer may cause problems with relatives and losses of property due to relatives. In same manner a afflicted Sun(also karak of heart ) in Capricorn which also afflicted Cancer Sign (karak sign for heart) by his aspects may cause heart problems.
6) Sun in Capricorn may cause bones problem regarding knees because Sun is karak of bones and Capricorn is karak of knees of kalpurush. Apart from this native may be suffering from Pitta or Vatta related dosh.
7)Sun in Capricorn may cause a unstable nature of livehood sources. Native may be involving in immoral way of earnings which is not supported by Dharma.
Rest explanation of sage words is beyond my little knowledge.