old 2019 notes on side projects

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+## 2019 Project: symbolic Orrery
+
+create personal tooling to comparisons of:
+- number/detail of bodies
+- newtonian / relativistic / MOND
+- different solvers/numerical
+- published ephemeris
+
+should be able to tweak/"compile" all the math from symbolic high-level syntax.
+
+also periodograms?
+
+refs:
+- SICM and func diff geo
+
+plan:
+- basic n-body solver with graphics in rust; not symbolic?
+- play with structures to improve
+- do basic solar system and compare existing
+    => until matching basic ephemeris
+- side: try other systems (attractors)
+- revisit SICM and try other structures. symbolic input, digital orrery paper
+- read and compare best current systems; import more complex models
+- func diff geo book
+
+tools/tech:
+- rust, racket, julia, python, wasm, typescript
+- gl, webgl
+- inter-process plotting/graphics
+- diff and other analysis
+
+
+## Specific Graphical
+
+These could all be xscreensaver things in rust?
+
+- GPU fluid 2D: smoke, liquid
+- n-body, attractors
+- 3D Box2D constraint kinetics simulation thing
+  -> to understand rigid constraint satisfaction
+- somewhat generic graphic runtime
+  -> takes in AST model or scheme
+  -> JIT compiles somehow?
+  -> solving with error propagation
+  -> fast interactive phase space exploration
+  -> periodograms
+  -> julia or rust?
+
+
+## Big List
+
 agent-based natural modeling
 
 point/particle graphics