Determining parameters of Moon's orbital and rotational motion from LLR observations using GRAIL and IERS-recommended models · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1606.08376/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTDetermining parameters of Moon's orbital and rotational motion from LLR observations using GRAIL and IERS-recommended models — mentioned by raattgifthttps://news.ycombinator.com/item?id=32171421urn:hackerpapers:mention:1606.08376:32171421Wed, 20 Jul 2022 20:03:12 GMT<p>2/2 [sorry that this will be out of order] For a (physical) relativist, the speed of light is really simple. c = 1, everywhere and everywhen. &lt;https://en.wikipedia.org/wiki/Geometrized_unit_system&gt; This is because we have excellent evidence for the utility of &lt;https://en.wikipedia.org/wiki/Pseudo-Riemannian_manifold#App...&gt;, and the further astrophysically-driven demands of global hyperbolicity or at least reasonably strong causality conditions, no isometric embeddings, geodesic incompleteness, asymptotic flatness around sources, junctions in sufficiently flat space, and energy conditions.…</p><p><a href="https://hackerpaper.kaipfister.de/p/1606.08376/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.EP