jyotish ka adhar nimnalikhit char tathyon par adharit hai. yadi in tathyon ko bhali bhanti samajh liya jay to jyotish ko samjhna bahut asan hai. aj tak vishva men jitne bhi jyotishi hue hain ve sab inhin char tathyon ka adhyayan karke hi vishleshan karte hain aur faladesh karte hain. in char tathyon ke alava jyotish men aur kuch bhi nahin hai. ve tathya hain -
grah - 9 (surya, chandra, mangal, budh, guru, shukra, shani, rahu, ketu)
bhav- 12 (lagn, dhan, parakram, sukh, santan, rog, vivah, mrityu, bhagya, karm, ay, vyay)
rashi - mesh, vrish, mithun, kark, sinh, kanya, tula, vrishchik, dhanu, makar, kunbh, min
nakshatra - ashvini, bharni, krittika, rohini, mrigshira, adrra, punarvasu, pushya, ashlesha, magha, pu.fa., u.fa., hast, chitra, svati, vishakha, anuradha, jyeshtha, mul, pu.sha., u.sha., shravan, dhanishtha, shatbhisha, pu.bha., u.bha., revti