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how to add planet ceres in astronomy.js?

2

I want to modify astronomy.js and astronomy.ts, I want to know how to calculate the planet Ceres and what various websites?

Solar eclipse problems in stellarium

3

If you want to calculate the position of the solar eclipse, width of the umbra, sun/moon diameter ratio, etc. "setUseTopocentricCoordinates" must be false, if not false, what is happening, is...

Besselian element problem besselian element problem when modifying astronomy.js or astronomy.ts

1

Is there any other way to calculate the width of the umbra other than the Besselian element which is inaccurate while Stellarium is accurate? We are trying the Besselian element...