Lower python dependencies

.github/workflows/ci.yml

@@ -46,19 +46,19 @@ jobs:
 
         - name: Tests, Python 3.14
           # Doctests are run only for most recent Python (see noxfile.py)
-          os: ubuntu-latest
+          os: macos-latest
           python: '3.14'
           nox_session: tests-3.14
 
-        - name: Tests, Python 3.13
-          os: macos-latest
-          python: '3.13'
+        - name: Tests, Python 3.10
+          os: windows-latest
+          python: '3.10'
           nox_session: tests-3.13
 
-        - name: Tests, Python 3.12
-          os: windows-latest
-          python: '3.12'
-          nox_session: tests-3.12
+        - name: Tests, Python 3.9
+          os: ubuntu-latest
+          python: '3.9'
+          nox_session: tests-3.9
 
         - name: Static type checking with ty, Python 3.14, Ubuntu
           os: ubuntu-latest

noxfile.py

@@ -30,7 +30,14 @@
 
 nox.options.default_venv_backend = "uv"
 
-SUPPORTED_PYTHON_VERSIONS: tuple[str, ...] = ("3.12", "3.13", "3.14")
+SUPPORTED_PYTHON_VERSIONS: tuple[str, ...] = (
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+    "3.14",
+)
 SUPPORTED_OPERATING_SYSTEMS: tuple[str, ...] = ("linux", "macos", "windows")
 
 MAXPYTHON = max(SUPPORTED_PYTHON_VERSIONS)

pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
 build-backend = "uv_build"
 requires = [ "uv-build>=0.12.5,<0.13" ]
@@ -13,16 +13,49 @@
   { name = "Joy Velasquez" },
   { name = "Nick Murphy", email = "namurphy@cfa.harvard.edu" },
 ]
-requires-python = ">=3.12"
+requires-python = ">=3.9"
 classifiers = [
   "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-  "astropy>=3",
-  "plasmapy>=0.3.1",
+  "argcomplete>=3.6.3",
+  "bokeh>=2.3.3",
+  "cached-property>=1.5.2",
+  "certifi>=2020.4.5.1",
+  "charset-normalizer>=3.4.7",
+  "cycler>=0.11",
+  "et-xmlfile>=2",
+  "h5py>=3.1",
+  "idna>=3.16",
+  "imap-tools>=1.13",
+  "jinja2>=3.0.3",
+  "kiwisolver>=1.3.1",
+  "markupsafe>=2.0.1",
+  "matplotlib>=3.3.4",
+  "numpy>=1.19.5",
+  "openpyxl>=3.1.5",
+  "packaging>=21.3",
+  "pillow>=8.4",
+  "pip>=26.0.1",
+  "pyparsing>=3.0.7",
+  "python-dateutil>=2.8.2",
+  "pyyaml>=6",
+  "requests>=2.32.5",
+  "scipy>=1.5.4",
+  "setuptools>=82.0.1",
+  "six>=1.16",
+  "spacepy>=0.4.1",
+  "spiceypy>=4.0.1",
+  "tornado>=6.1",
+  "typing-extensions>=4.1.1",
+  "urllib3>=2.6.3",
+  "xlrd>=1.2",
 ]
 
 [dependency-groups]
@@ -34,29 +67,29 @@
   { include-group = "zizmor" },
 ]
 test = [
-  "pytest>=9.1",
-  "pytest-filter-subpackage>=0.2",
-  "pytest-xdist>=3.8",
+  "pytest",
+  "pytest-filter-subpackage",
+  "pytest-xdist",
 ]
 docs = [
-  "sphinx>=9.1",
+  "sphinx",
 ]
 lint = [
-  "pre-commit>=4.6.2",
+  "pre-commit",
 ]
 nox = [
-  "nox>=2026.8.10",
-  "nox-uv>=0.8",
+  "nox",
+  "nox-uv",
 ]
 typecheck = [
-  "ty>=0.0.74",
+  "ty",
 ]
 zizmor = [
-  "zizmor>=1.29",
+  "zizmor",
 ]
 
 [tool.ruff]
-target-version = "py312"
+target-version = "py39"
 namespace-packages = [ ".github/workflows", "docs" ]
 extend-exclude = [
   ".code",