Own sign (Swakshetra)
A planet is in its own sign (swakshetra) when it occupies a sign it rules, such as Mars in Aries or Saturn in Capricorn. It is at home there: comfortable, confident and able to look after that house’s affairs.
Also known as: swagrahi, swarashi, own house, swa rashi
The Sun rules Leo and the Moon rules Cancer. Each of the other five planets rules two signs: Mars has Aries and Scorpio, Mercury Gemini and Virgo, Jupiter Sagittarius and Pisces, Venus Taurus and Libra, and Saturn Capricorn and Aquarius. Rahu and Ketu are often treated as co-rulers of Aquarius and Scorpio; some texts give them Virgo and Pisces instead.
A planet in its own sign behaves like a person in their own home: it acts with ease and looks after the house it occupies. When Mars, Mercury, Jupiter, Venus or Saturn is in its own sign in a kendra, it forms one of the Pancha Mahapurusha yogas, linked with a strong and distinctive character.
Own sign ranks below exaltation and moolatrikona, but it is a reliable sign of strength. As always, what the planet does for you also depends on the houses it rules from your ascendant.