The Eighteen Astronomical Treatises !

Of all the eighteen astronomical treatises
Aryabhateeyam is extolled
Also Mahabhaskareeyam
These treatises deal with computation
Of planet's longitudes !
Longitude corrected thrice
To get the true longitudes
Mahabhaskareeya talks about
The eight motions of planets
Direct or retrograde
Retrogression is Vakra
Ativakra is maximum Retrogression
End of Retrogression is Kutila
Slow motion is Manda
Slower motion is Mandatara
Mean motion is Sama
Fast motion is Sheegra
And faster motion is Sheegratara !

Eighteen Seers wrote
Eighteen treatises astronomical
Surya wrote Surya Siddhanta
Pitamaha wrote Pitamaha Siddhanta
Vyasa Siddhanta was done by Vyasa
Vasishta wrote Vasishta Siddhanta
Atri wrote Atri Siddhanta
Parasara Siddhanta was written by Parasara
Lomasa, Paulasa, Chyavana
Yavana, Bhrigu all wrote about the Heavens !