Good point. It is pointless to worship something that doesn't even know you are worshipping it because it isn't a sentient being (a.k.a: the sun).
I don't understand the link between 'it's powerful ... THEREFORE we should worship it'.
I don't think it's as straight forward as that.
It's not "It's powerful ... THEREFORE we should worship it".
It is simply "It's powerful ... THEREFORE we worship it".
Power inspires awe. It's just the actual expression of this awe that may vary (anything from building temples to exclaiming "oh, this is so wonderful!").