The Rishies encountered a lot of difficulties while computing, Ascensional Difference, Equation of Time, Angle of Solar Declination and Refraction, the four intervening variables which intermediate in the causal equation while counting Sunrise ( upon which entire Vedic Astrology is founded ) were all difficult to compute. So they recommended Tables to students.
If 360 degrees = 24 Houra
360/24 = 15 degrees = 1 Hour, Ardha Rasi Bhaveth Hora
A Zodiacal Sign is a Rasi of 30 degrees each and there are 12 Rasis in the Dwadasa Rasyatmaka Jagat, the Tropical Zodiac, and hence half a house is Hora or Hour
Horeti Lagnam Bhavanasya chardham.
If 15 degrees =1 Hour = 60 minutes,
then, I degree = 4 minutes !
The Science of Time, Hora Sastra, was born
