Surya (Sun) in Vedic astrology: meaning, signs, gem and mantra

Stands for
the self, father, authority, government, health and vitality
Rules
Simha
Exalted in
Mesha
Debilitated in
Tula
Day
Sunday
Colour
red, saffron
Gem
ruby
Mahadasha
6 years
Nakshatras it rules
Krittika, Uttara Phalguni, Uttara Ashadha
Mantra
ॐ सूर्याय नमः

Offer water to the rising Sun and chant the Gayatri mantra.

Surya · Chandra · Mangal · Budh · Guru · Shukra · Shani · Rahu · Ketu