Technical adstrate in Indo-aryan?

As most of you realize I have no expertise in historical
linguistics but much curiosity! Since early Indo-Europeans had
no astronomy expertise, but Harappans did, a Harappan adstrate
should exist in Aryan: math, astronomical and architectural
terms. Is it there?

(Other questions I'd like to pose to the group, hopefully
without overstaying my welcome, concern Etruscan:
How well known is it? Is it related to I-E,
and if so, roughly when did it diverge from I-E?)