Recent indie stuff I've read includes "Star Soldier" by Heppner, which is only available on Amazon, I think. That is pretty hard SF, lots of stuff in there discussing how many millions of kilometers the ships are apart and how long a laser beam takes to reach the target. The orbital positions of the planets make a big deal as to how ships can move, etc. The details in that book on the combat are unlike anything I've ever read. Many of us have listed stuff here I would not call "hard" SF, as it really is more in the "adventure" SF category.
-BVL
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