checkpoint, idk what is going on here anymore

posts/2024-12-25-moon-cannon-duece/index.quarto_ipynb

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+{
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "---\n",
+        "title: \"Moon Cannon: dos\"\n",
+        "description: |\n",
+        "  Can you shoot Earth from the Moon? Simulate lunar ballistic launches with Julia. Explore orbital mechanics, gravity, and drag in a simplified Moon-to-Earth cannon model.\n",
+        "date: 2024-09-25\n",
+        "categories:\n",
+        "  - Julia\n",
+        "  - Astrodynamics\n",
+        "  - Code\n",
+        "  - Aerospace\n",
+        "  - Space\n",
+        "  - Math\n",
+        "draft: false\n",
+        "freeze: false\n",
+        "image: moon_spirograph.png\n",
+        "---"
+      ],
+      "id": "e623b02d"
+    },
+    {
+      "cell_type": "code",
+      "metadata": {},
+      "source": [
+        "using SPICE\n",
+        "\n",
+        "const LSK = \"https://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/naif0012.tls\"\n",
+        "const SPK = \"https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/planets/de440.bsp\"\n",
+        "\n",
+        "# Download kernels\n",
+        "download(LSK, \"naif0012.tls\")\n",
+        "download(SPK, \"de440.bsp\")\n",
+        "\n",
+        "# Load leap seconds kernel\n",
+        "furnsh(\"naif0012.tls\")\n",
+        "\n",
+        "# Load a planetary ephemeris kernel\n",
+        "furnsh(\"de440.bsp\")\n",
+        "\n",
+        "function get_planet_positions(epoch)\n",
+        "    planets = [\"MERCURY\", \"VENUS\", \"EARTH\", \"MARS\", \n",
+        "               \"JUPITER\", \"SATURN\", \"URANUS\", \"NEPTUNE\"]\n",
+        "    positions = Dict()\n",
+        "\n",
+        "    for planet in planets\n",
+        "        # Get position vector in km relative to Sun\n",
+        "        pos, _ = spkpos(planet, epoch, \"J2000\", \"NONE\", \"earth\")\n",
+        "        positions[planet] = pos\n",
+        "    end\n",
+        "\n",
+        "    return positions\n",
+        "end\n",
+        "\n",
+        "# Example usage (epoch in UTC)\n",
+        "epoch = \"1995-12-17T12:00:00\" |> utc2et\n",
+        "positions = get_planet_positions(epoch)"
+      ],
+      "id": "72207da4",
+      "execution_count": null,
+      "outputs": []
+    }
+  ],
+  "metadata": {
+    "kernelspec": {
+      "name": "julia-1.11",
+      "language": "julia",
+      "display_name": "Julia 1.11.1",
+      "path": "/root/.local/share/jupyter/kernels/julia-1.11"
+    }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
+}