Eclipse calculations from Surysiddhanta

[Guest guest]

Dear all,I understand that in the current Indian Panchangas, which are based on Suryasiddhanta, the time of the eclipses are given not from calculations based on the Suryasiddhanta but from the modern astronomical data obtained from the Positional Astronomy Centre in Kolkata. If this is really so what could be the reason? To my knowledge Hartley commented that eclipses can be calculated from the Suryasiddhanta but the calculations become more correct for the past edlipses. This may probably give a hint that the calculations based on Suryasiddhanta were more appropriate at the time of the composition of the Suryasiddhanta. May I invite the comments on this from the learned scholars of Suryasiddhanta?Regards,Sunil K. BHattacharjya

[Guest guest]

according to my knowledge following changes have taken place:

1) Change in synodic month because moon is going away from

earth.

2)Delta t correction due to change in speed of earth

3)Change in speed of ascending/Descending nodes.

As these changes are very slow, these can be noticed only after

thousands of years.

Prafulla

 

, Sunil Bhattacharjya

<sunil_bhattacharjya wrote:

>

> Dear all,

>

> I understand that in the current Indian Panchangas, which are based on

Suryasiddhanta, the time of the eclipses are given not from calculations based

on the Suryasiddhanta but from the modern astronomical data obtained from  the

Positional Astronomy Centre in Kolkata. If this is really so what could be the

reason? To my knowledge Hartley commented that eclipses can be calculated from

the Suryasiddhanta but the calculations become more correct for the past

edlipses. This may probably give a hint that the calculations based on

Suryasiddhanta were more appropriate at the time of the composition of the

Suryasiddhanta. May I invite the comments on this from the learned scholars of

Suryasiddhanta?

>

> Regards,

>

> Sunil K. BHattacharjya

>