BHASKARA II SIDDHANTA SIROMANY (1114 AD)
Aakrushti sakthischa mahee thayaa yath khastham guru
svaabhimukham svasakthyaa aakrushyathe thathpathatheeva
bhaathi same samanthaath kva pathathyayam khe:
This earth attracts whatever solid materials are in the space, by her own force of attraction towards her (earth).
All those subjected to this attractional force fall, to the earth.
Due to equal force of attraction among the celestial bodies,
where can each among them fall? (Siddhanta siromani Bhuvanakosham 6)