From abf01d48b8acc1200d2bc8d6df76471ee622c3e4 Mon Sep 17 00:00:00 2001
From: Flancian <0@flancia.org>
Date: Tue, 20 May 2025 00:33:06 +0200
Subject: [PATCH] autopushed

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 2025-05-20.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/2025-05-20.md b/2025-05-20.md
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     - As in the little devices I've built
 - Today (actually yesterday) I saw a great video on the [[principle of least action]] and it blew my mind a bit. It also introduced me to diffraction grating effects -- which I had heard about but hadn't grokked/seen demonstrated.
   - The fact that angular momentum is quantized... wow. Also it introduced me to [[diffraction gratings]], which I had heard of only in passing.
+  - And angular momentum has the same unit as action: Joule-second.
   - This all made me think also of...
     - Could you use diffraction gratings at astronomic scales to see into the past? E.g. by making visible light from a star that has taken a longer (slower) path to get to us.
     - The effect that makes lights 'stretch out' in one direction in some mediums, like water (think of night lights reflected on a lake) or... the effect that is apparent in my chrome kitchen countertop that is quite something and I sometimes call the [[rainbow folding]]). I'm unsure if these are really related but something about the discussion about the paths that light can take made me think of it.