diff --git a/applications/applications.rst b/applications/applications.rst
index da18608a..cc5eadcf 100644
--- a/applications/applications.rst
+++ b/applications/applications.rst
@@ -1,5 +1,10 @@
 .. _applications:
 
+Python Applications
+===================
+
+Python resources by category with relevant context and links to additional resources and references.
+
 .. grid:: 3
     :gutter: 2
 
@@ -8,28 +13,26 @@
         .. grid:: 1
             :gutter: 1
 
-            .. card:: Dates and Times
-
-                - `Working with Date and Time <applications/date_time/datetime.ipynb>`_
-
-            .. card:: Plot Types
+            .. card:: Time
 
+                - `Dates and times <applications/datetime.ipynb>`_
 
     .. grid-item::
 
         .. grid:: 1
             :gutter: 1
 
-            .. card:: Data Analysis
+            .. card:: Math
 
-                - `General Applied Math <applications/data_analysis/general_applied_math.ipynb>`_
-                - `Calculating Climatologies <applications/data_analysis/climatology.ipynb>`_
-                - `Spectral Analysis <applications/data_analysis/spectral_analysis.ipynb>`_
-                - `Humid Heat Metrics <applications/data_analysis/humid_heat_metrics.ipynb>`_
+                - `General applied math <applications/general_applied_math.ipynb>`_
+                - `Spectral analysis <applications/spectral_analysis.ipynb>`_
 
     .. grid-item::
 
         .. grid:: 1
             :gutter: 1
 
-            .. card:: Regridding
+            .. card:: Geoscience
+
+                - `Climatology <applications/climatology.ipynb>`_
+                - `Humid heat metrics <applications/humid_heat_metrics.ipynb>`_
diff --git a/applications/data_analysis/climatology.ipynb b/applications/climatology.ipynb
similarity index 100%
rename from applications/data_analysis/climatology.ipynb
rename to applications/climatology.ipynb
diff --git a/applications/data_analysis/data_analysis.rst b/applications/data_analysis/data_analysis.rst
deleted file mode 100644
index 93ad68b9..00000000
--- a/applications/data_analysis/data_analysis.rst
+++ /dev/null
@@ -1,14 +0,0 @@
-.. currentmodule:: geocat.applications
-
-.. _applications_data_analysis:
-
-Data Analysis
-=============
-
-.. toctree::
-    :maxdepth: 1
-
-    general_applied_math.ipynb
-    climatology.ipynb
-    spectral_analysis.ipynb
-    humid_heat_metrics.ipynb
diff --git a/applications/date_time/date_time.rst b/applications/date_time/date_time.rst
deleted file mode 100644
index ebd3c8c2..00000000
--- a/applications/date_time/date_time.rst
+++ /dev/null
@@ -1,11 +0,0 @@
-.. currentmodule:: geocat.applications
-
-.. _applications_datetime:
-
-Dates and Times
-===============
-
-.. toctree::
-    :maxdepth: 1
-
-    datetime.ipynb
diff --git a/applications/date_time/datetime.ipynb b/applications/datetime.ipynb
similarity index 100%
rename from applications/date_time/datetime.ipynb
rename to applications/datetime.ipynb
diff --git a/applications/data_analysis/general_applied_math.ipynb b/applications/general_applied_math.ipynb
similarity index 100%
rename from applications/data_analysis/general_applied_math.ipynb
rename to applications/general_applied_math.ipynb
diff --git a/applications/data_analysis/humid_heat_metrics.ipynb b/applications/humid_heat_metrics.ipynb
similarity index 100%
rename from applications/data_analysis/humid_heat_metrics.ipynb
rename to applications/humid_heat_metrics.ipynb
diff --git a/applications/plot_types/plot_types.rst b/applications/plot_types/plot_types.rst
deleted file mode 100644
index 13196f65..00000000
--- a/applications/plot_types/plot_types.rst
+++ /dev/null
@@ -1,10 +0,0 @@
-.. currentmodule:: geocat.applications
-
-.. _applications_plot_types:
-
-Plot Types
-==========
-
-.. toctree::
-   :maxdepth: 1
-   :hidden:
diff --git a/applications/data_analysis/spectral_analysis.ipynb b/applications/spectral_analysis.ipynb
similarity index 100%
rename from applications/data_analysis/spectral_analysis.ipynb
rename to applications/spectral_analysis.ipynb
diff --git a/index.rst b/index.rst
index 3750437f..f529ee83 100644
--- a/index.rst
+++ b/index.rst
@@ -1,11 +1,11 @@
-.. geocat-applications documentation master file
+.. geocat-applications documentation main file
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
 .. module:: geocat.applications
 
 .. meta::
-   :description: GeoCAT-applications
+   :description: geocat-applications
    :keywords: geocat, geocat-applications,
               geocat applications,
               wrf, python, wrf-python, weather research and forecasting,
@@ -17,9 +17,6 @@
               pynio, pyngl, interpolation
 
 
-.. .. image:: _static/images/nsf.png
-..    :scale: 100%
-..   :align: right
 
 
 
@@ -27,16 +24,17 @@ GeoCAT Applications
 ===================
 
 GeoCAT Applications is a community resource managed by the GeoCAT team. Inspired by the
-`NCL Applications <https://www.ncl.ucar.edu/Applications/>`_ page, this is designed to be a quick reference
-demonstrating capabilities within the Scientific Python Ecosystem that may be relevant to your geoscience workflows.
+`NCL Applications <https://www.ncl.ucar.edu/Applications/>`_ page, GeoCAT Applications is
+designed to be a quick reference guide demonstrating capabilities within the scientific
+Python ecosystem that may be relevant to your geoscience workflows.
 
 New to Python or GeoCAT Applications? Check out the `Getting Started <GETTING_STARTED.md>`_ guide!
 
-Python Examples
----------------
+Python Applications
+-------------------
 
 .. include:: applications/applications.rst
-
+    :start-line: 5
 
 .. TIP::
     If you're looking for NCL to Python examples, please visit :ref:`ncl_applications`.
@@ -52,11 +50,9 @@ Python Examples
 .. toctree::
     :maxdepth: 2
     :hidden:
-    :caption: Applications
+    :caption: Python
 
-    Plot Types <applications/plot_types/plot_types>
-    Data Analysis <applications/data_analysis/data_analysis>
-    Date and Time <applications/date_time/date_time>
+    Applications <applications/applications>
 
 .. toctree::
     :maxdepth: 2
@@ -64,20 +60,20 @@ Python Examples
     :caption: NCL to Python
 
     NCL Index <ncl/ncl_index/ncl_index>
-    NCL Applications <ncl/ncl_entries/ncl_entries>
+    Applications <ncl/ncl_entries/ncl_entries>
 
 .. toctree::
     :maxdepth: 2
     :hidden:
     :caption: Contributing
 
-    Contributor Guide <CONTRIBUTING.md>
     Code of Conduct <CODE_OF_CONDUCT.md>
+    Contributor Guide <CONTRIBUTING.md>
 
 .. toctree::
     :maxdepth: 2
     :hidden:
-    :caption: Getting Support
+    :caption: Support
 
     GitHub Issues <https://github.com/NCAR/geocat-applications/issues>
-    Feature Request Form <https://forms.gle/6DTo3ELLri4DAGfG8>
+    Suggestion Box <https://forms.gle/6DTo3ELLri4DAGfG8>
diff --git a/ncl/ncl_entries/climatology_functions.ipynb b/ncl/ncl_entries/climatology.ipynb
similarity index 99%
rename from ncl/ncl_entries/climatology_functions.ipynb
rename to ncl/ncl_entries/climatology.ipynb
index 77c14225..0e3b7c1b 100644
--- a/ncl/ncl_entries/climatology_functions.ipynb
+++ b/ncl/ncl_entries/climatology.ipynb
@@ -322,7 +322,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.3"
+   "version": "3.12.7"
   }
  },
  "nbformat": 4,
diff --git a/ncl/ncl_entries/days_in_month.ipynb b/ncl/ncl_entries/days_in_month.ipynb
deleted file mode 100644
index d2d87bfe..00000000
--- a/ncl/ncl_entries/days_in_month.ipynb
+++ /dev/null
@@ -1,189 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "85f94cfa6f4fae8e",
-   "metadata": {},
-   "source": [
-    "# days_in_month"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "5df936372159018b",
-   "metadata": {},
-   "source": [
-    "## Overview\n",
-    "NCL's [`days_in_month`](https://www.ncl.ucar.edu/Document/Functions/Built-in/days_in_month.shtml) calculates the number of days in a month given a month and year."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "774124772c1ca8d4",
-   "metadata": {},
-   "source": [
-    "## Grab and Go"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "71b6e5623fb2f661",
-   "metadata": {
-    "ExecuteTime": {
-     "end_time": "2024-06-06T20:18:11.395749Z",
-     "start_time": "2024-06-06T20:18:11.262729Z"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "import cftime\n",
-    "\n",
-    "day = 1\n",
-    "month = 2\n",
-    "year = 2024\n",
-    "\n",
-    "days = cftime.datetime(year, month, day, calendar='standard').daysinmonth\n",
-    "\n",
-    "days"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "471ffe2f336259de",
-   "metadata": {},
-   "source": [
-    "---"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "6b288584e85b49b9",
-   "metadata": {},
-   "source": [
-    "## Using the `calendar` module\n",
-    "The [`calendar`](https://docs.python.org/3/library/calendar.html) module is part of the Python Standard Library and could be sufficient to calculate the number of days in a month."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "d54840a911c73610",
-   "metadata": {
-    "ExecuteTime": {
-     "end_time": "2024-06-06T20:18:11.399650Z",
-     "start_time": "2024-06-06T20:18:11.396804Z"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "from calendar import monthrange\n",
-    "\n",
-    "month = 2\n",
-    "year = 1500\n",
-    "first_day, num_days = monthrange(year, month)\n",
-    "print(f\"Month {month} in {year} has {num_days} days\")"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "82c5bb43f75c474e",
-   "metadata": {},
-   "source": [
-    "However, the `calendar` only uses a proleptic Gregorian calendar. If you need to work with other calendars, the `calendar` module will not be sufficient."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "7bfc78baeee6cef4",
-   "metadata": {},
-   "source": [
-    "## Using `cftime`\n",
-    "[`cftime`](https://unidata.github.io/cftime/index.html) supports all of the [CF Convention calendars](https://cfconventions.org/cf-conventions/cf-conventions#calendar). Here's how you can use `cftime` to calculate the number of days in a month."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "f762cbca2cf59dfa",
-   "metadata": {
-    "ExecuteTime": {
-     "end_time": "2024-06-06T20:18:11.403172Z",
-     "start_time": "2024-06-06T20:18:11.400471Z"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "import cftime\n",
-    "\n",
-    "day = 1\n",
-    "month = 2\n",
-    "year = 1500\n",
-    "\n",
-    "days = cftime.datetime(year, month, day, calendar='standard').daysinmonth\n",
-    "print(f\"standard calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")\n",
-    "\n",
-    "days = cftime.datetime(year, month, day, calendar='proleptic_gregorian').daysinmonth\n",
-    "print(f\"proleptic Gregorian calendar: \\t month {month} in {year} has {days} days\")\n",
-    "\n",
-    "days = cftime.datetime(year, month, day, calendar='julian').daysinmonth\n",
-    "print(f\"Julian calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")\n",
-    "\n",
-    "days = cftime.datetime(year, month, day, calendar='360_day').daysinmonth\n",
-    "print(f\"360 day calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "a8b079a3a3eb9f00",
-   "metadata": {},
-   "source": [
-    "## Differences between `cftime` and NCL's `days_in_month`\n",
-    "\n",
-    "### Calendars\n",
-    "The calendars available in `cftime` and NCL's `days_in_month`, while both based on the CF Conventions calendars, are slightly different.\n",
-    "\n",
-    "- `cftime` does support using `\"none\"` as a calendar type, but not for this particular function. \n",
-    "- NCL's `days_in_month` does not support the `proleptic_gregorian` calendar.\n",
-    "\n",
-    "### Numerical Differences\n",
-    "Additionally, the `\"standard\"` and `\"gregorian\"` calendars seem to disagree for some historical dates.\n",
-    "\n",
-    "### Input type\n",
-    "Notably, using `cftime` to calculate the number of days in a month works by getting a `daysinmonth` value from a `cftime.datetime` object, which means that the calculations for days in a month have to be collected through each date individually, while NCL's `days_in_month` can take in multidimensional integer arrays, given that the `year` and `month` arrays have the same dimensions."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "8eda876fd519891",
-   "metadata": {},
-   "source": [
-    "## Python Resources\n",
-    "- The `calendar` module [documentation](https://docs.python.org/3/library/calendar.html).\n",
-    "- The [`cftime.datetime` documentation](https://unidata.github.io/cftime/api.html#cftime.datetime).\n",
-    "- [\"Time series data\"](https://docs.xarray.dev/en/stable/user-guide/time-series.html) for working with time series data in xarray"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.3"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}
diff --git a/ncl/ncl_entries/ncl_entries.rst b/ncl/ncl_entries/ncl_entries.rst
index 9e216cd7..6c03b81c 100644
--- a/ncl/ncl_entries/ncl_entries.rst
+++ b/ncl/ncl_entries/ncl_entries.rst
@@ -1,23 +1,40 @@
 .. _ncl_applications:
 
-NCL Applications
-================
-
-Data Analysis
----------------
-.. toctree::
-    :maxdepth: 1
-
-    climatology_functions.ipynb
-    trigonometric_functions.ipynb
-    general_applied_math.ipynb
-    meteorology.ipynb
-    specx_specxy_anal.ipynb
-
-Dates and Times
----------------
-.. toctree::
-    :maxdepth: 1
-
-    days_in_month.ipynb
-    day_of_week.ipynb
+NCL to Python Applications
+==========================
+
+NCL to Python resources by category with relevant context
+and links to additional resources and references.
+
+.. grid:: 3
+    :gutter: 2
+
+    .. grid-item::
+
+        .. grid:: 1
+            :gutter: 1
+
+            .. card:: Time
+
+                - `Dates and times <time.ipynb>`_
+
+    .. grid-item::
+
+        .. grid:: 1
+            :gutter: 1
+
+            .. card:: Math
+
+                - `Trigonometry <trigonometry.ipynb>`_
+                - `General applied math <general_applied_math.ipynb>`_
+                - `Spectral analysis <spectral_analysis.ipynb>`_
+
+    .. grid-item::
+
+        .. grid:: 1
+            :gutter: 1
+
+            .. card:: Geoscience
+
+                - `Climatology <climatology.ipynb>`_
+                - `Meteorology <meteorology.ipynb>`_
diff --git a/ncl/ncl_entries/specx_specxy_anal.ipynb b/ncl/ncl_entries/spectral_analysis.ipynb
similarity index 97%
rename from ncl/ncl_entries/specx_specxy_anal.ipynb
rename to ncl/ncl_entries/spectral_analysis.ipynb
index a3cb2a0a..fa7d6074 100644
--- a/ncl/ncl_entries/specx_specxy_anal.ipynb
+++ b/ncl/ncl_entries/spectral_analysis.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# specx_specxy_anal\n",
+    "# Spectral Analysis\n",
     "\n",
     "This example demonstrates how to perform spectral and cross-spectral analysis using the `scipy.signal` module. To learn more about the functions and keyword arguments available in this package, read SciPy's [signal processing documentation](https://docs.scipy.org/doc/scipy/reference/signal.html).\n",
     "\n",
@@ -43,7 +43,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -131,7 +131,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -158,7 +158,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -185,7 +185,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -211,7 +211,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -240,7 +240,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -359,7 +359,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -421,7 +421,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -461,7 +461,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -519,7 +519,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "geocat_comp_build",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -533,9 +533,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.2"
+   "version": "3.12.7"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/ncl/ncl_entries/day_of_week.ipynb b/ncl/ncl_entries/time.ipynb
similarity index 55%
rename from ncl/ncl_entries/day_of_week.ipynb
rename to ncl/ncl_entries/time.ipynb
index 1685661d..24650da0 100644
--- a/ncl/ncl_entries/day_of_week.ipynb
+++ b/ncl/ncl_entries/time.ipynb
@@ -4,22 +4,27 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# day_of_week"
+    "# Time"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "jp-MarkdownHeadingCollapsed": true
+   },
    "source": [
     "## Overview\n",
-    "NCL's [`day_of_week`](https://www.ncl.ucar.edu/Document/Functions/Built-in/day_of_week.shtml) calculates the day of the week given month, day, and year."
+    "This section covers NCL functions relating to dates and times:"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Grab and Go"
+    "## day_of_week\n",
+    "NCL's [`day_of_week`](https://www.ncl.ucar.edu/Document/Functions/Built-in/day_of_week.shtml) calculates the day of the week given month, day, and year.\n",
+    "\n",
+    "### Grab and Go"
    ]
   },
   {
@@ -51,7 +56,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Using the `datetime` module\n",
+    "### Using the `datetime` module\n",
     "The [`datetime`](https://docs.python.org/3/library/datetime.html) module is part of the Python Standard Library and could be sufficient to calculate the day of the week. "
    ]
   },
@@ -84,7 +89,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Using `cftime`\n",
+    "### Using `cftime`\n",
     "[`cftime`](https://unidata.github.io/cftime/index.html) offers a solution to these potential issues by supporting year 0 and all of the [CF Convention calendars](https://cfconventions.org/cf-conventions/cf-conventions#calendar). Here is how you can use `cftime` to calculate the day of the week."
    ]
   },
@@ -132,14 +137,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Differences between `cftime` and NCL's `day_of_week`"
+    "### Differences between `cftime` and NCL's `day_of_week`"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Calendars\n",
+    "#### Calendars\n",
     "NCL's `day_of_week` only supports the proleptic Gregorian calendar, while the `cftime` module supports all CF conventions calendars, including the `proleptic_gregorian` calendar."
    ]
   },
@@ -147,7 +152,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Input Type\n",
+    "#### Input Type\n",
     "Notably, using `cftime` to calculate the day of the week works by getting a `strftime()` value from a `cftime.datetime` object, which means that the calculations for the day of the week have to be collected through each date individually, while NCL's `days_in_month` can take in multidimensional integer arrays, given that the `year` and `month` arrays have the same dimensions."
    ]
   },
@@ -155,7 +160,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Year 0\n",
+    "#### Year 0\n",
     "There is a slight difference in the way that NCL's `day_of_week` and the `cftime` module handle the year 0.\n",
     "- NCL's `day_of_week` supports all positive years and year 0 by default.\n",
     "- The `cftime` module supports all years, but handling for year 0 is dependent upon the calendar and/or the `has_year_zero` keyword argument."
@@ -165,21 +170,120 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Python Resources\n",
-    "- The `datetime` module [documentation](https://docs.python.org/3/library/datetime.html).\n",
-    "- The `cftime.datetime` [documentation](https://unidata.github.io/cftime/api.html#cftime.datetime).\n",
-    "- [Working with Dates and Times](https://ncar.github.io/geocat-applications/applications/date_time/datetime.html) GeoCAT Applications notebook."
+    "## days_in_month\n",
+    "NCL's [`days_in_month`](https://www.ncl.ucar.edu/Document/Functions/Built-in/days_in_month.shtml) calculates the number of days in a month given a month and year.\n",
+    "\n",
+    "### Grab and Go"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import cftime\n",
+    "\n",
+    "day = 1\n",
+    "month = 2\n",
+    "year = 2024\n",
+    "\n",
+    "days = cftime.datetime(year, month, day, calendar='standard').daysinmonth\n",
+    "\n",
+    "days"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": []
+   "source": [
+    "### Using the `calendar` module\n",
+    "The [`calendar`](https://docs.python.org/3/library/calendar.html) module is part of the Python Standard Library and could be sufficient to calculate the number of days in a month."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from calendar import monthrange\n",
+    "\n",
+    "month = 2\n",
+    "year = 1500\n",
+    "first_day, num_days = monthrange(year, month)\n",
+    "print(f\"Month {month} in {year} has {num_days} days\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "However, the `calendar` only uses a proleptic Gregorian calendar. If you need to work with other calendars, the `calendar` module will not be sufficient.\n",
+    "\n",
+    "### Using `cftime`\n",
+    "[`cftime`](https://unidata.github.io/cftime/index.html) supports all of the [CF Convention calendars](https://cfconventions.org/cf-conventions/cf-conventions#calendar). Here's how you can use `cftime` to calculate the number of days in a month."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import cftime\n",
+    "\n",
+    "day = 1\n",
+    "month = 2\n",
+    "year = 1500\n",
+    "\n",
+    "days = cftime.datetime(year, month, day, calendar='standard').daysinmonth\n",
+    "print(f\"standard calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")\n",
+    "\n",
+    "days = cftime.datetime(year, month, day, calendar='proleptic_gregorian').daysinmonth\n",
+    "print(f\"proleptic Gregorian calendar: \\t month {month} in {year} has {days} days\")\n",
+    "\n",
+    "days = cftime.datetime(year, month, day, calendar='julian').daysinmonth\n",
+    "print(f\"Julian calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")\n",
+    "\n",
+    "days = cftime.datetime(year, month, day, calendar='360_day').daysinmonth\n",
+    "print(f\"360 day calendar: \\t\\t\\t\\t month {month} in {year} has {days} days\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Differences between `cftime` and NCL's `days_in_month`\n",
+    "\n",
+    "#### Calendars\n",
+    "The calendars available in `cftime` and NCL's `days_in_month`, while both based on the CF Conventions calendars, are slightly different.\n",
+    "\n",
+    "- `cftime` does support using `\"none\"` as a calendar type, but not for this particular function. \n",
+    "- NCL's `days_in_month` does not support the `proleptic_gregorian` calendar.\n",
+    "\n",
+    "#### Numerical Differences\n",
+    "Additionally, the `\"standard\"` and `\"gregorian\"` calendars seem to disagree for some historical dates.\n",
+    "\n",
+    "#### Input type\n",
+    "Notably, using `cftime` to calculate the number of days in a month works by getting a `daysinmonth` value from a `cftime.datetime` object, which means that the calculations for days in a month have to be collected through each date individually, while NCL's `days_in_month` can take in multidimensional integer arrays, given that the `year` and `month` arrays have the same dimensions."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Python Resources\n",
+    "- The `datetime` module [documentation](https://docs.python.org/3/library/datetime.html)\n",
+    "- The `cftime.datetime` [documentation](https://unidata.github.io/cftime/api.html#cftime.datetime)\n",
+    "- The [time series data](https://docs.xarray.dev/en/stable/user-guide/time-series.html) section of the Xarray documentation for working with time series data in Xarray\n",
+    "- [Working with Dates and Times](https://ncar.github.io/geocat-applications/applications/date_time/datetime.html) GeoCAT Applications notebook"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "geocat-applications",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -193,9 +297,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.3"
+   "version": "3.12.7"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/ncl/ncl_entries/trigonometric_functions.ipynb b/ncl/ncl_entries/trigonometry.ipynb
similarity index 99%
rename from ncl/ncl_entries/trigonometric_functions.ipynb
rename to ncl/ncl_entries/trigonometry.ipynb
index 9ece3a08..7626c7ae 100644
--- a/ncl/ncl_entries/trigonometric_functions.ipynb
+++ b/ncl/ncl_entries/trigonometry.ipynb
@@ -5,13 +5,15 @@
    "id": "e630c395-5419-4786-84fe-94bc0f0abbdc",
    "metadata": {},
    "source": [
-    "# Trigonometric Functions"
+    "# Trigonometry"
    ]
   },
   {
    "cell_type": "markdown",
    "id": "cac2fd03-5dcf-478a-8cd5-72207bc2cb4b",
-   "metadata": {},
+   "metadata": {
+    "jp-MarkdownHeadingCollapsed": true
+   },
    "source": [
     "## Overview\n",
     "The trigonometric functions for sine, cosine, and tangent (and associated inverse functions) are built-in functions in Python as well as part of a common Python package `numpy`\n",
@@ -701,7 +703,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.8"
+   "version": "3.12.7"
   }
  },
  "nbformat": 4,