The most ancient Indian astrology treatise is the ‘Brihat Parashar Hora Shastra’, (बृहत् पराशर होरा शास्त्र). It was written by Rishi Parashara, the father of Rishi Vyasa. The ‘Brihat Parashar Hora Shastra’ is the treatise on which the entire Vedic astrology system is based.
‘Brihat’ (बृहत्) translates as ‘great’. ‘Hora’ (होरा) is the Sanskrit term for ‘hour’, ‘horoscope’ and ‘half of a zodiacal sign’ which equals 15 degrees. It is from the Sanskrit ‘hora’ (होरा) that the English word ‘hour’ is derived.
Western dictionaries claim that ‘hour’ originates from the Greek ‘hora’ which means ‘limited time’ which itself, is said, originates from the Proto-Indo-European root word ‘yer’.
Rishi Parashara was the grandfather of Dhritrarashtra and Pandu, and hence the great grandfather of the Kauravas and the Pandavas of the Mahabharata. He was the grandson of the Rig Vedic Rishi Vashist, whose existence has now been dated to at least 3700 BC from artifacts found in the Saraswati region.