Finalize v0.15.1

docs/sphinx/source/user_guide/extras/nomenclature.rst

@@ -106,6 +106,9 @@ There is a convention on consistent variable names throughout the library:
     gri
         Ground-reflected irradiance
 
+    iam
+        Incidence angle modifier
+
     i_sc
         Short circuit module current
 

docs/sphinx/source/user_guide/modeling_topics/iam.rst

@@ -15,7 +15,7 @@ the reduction at normal incidence is implicit in the PV module's power rating
 and does not need to be accounted for separately in a performance model.
 Therefore, only the extra reduction at non-normal incidence should be modeled.
 
-This is done using incidence angle modififer (:term:`IAM`) models.
+This is done using incidence angle modififer (:term:`IAM <iam>`) models.
 Conceptually, IAM is the fraction of incident light that is
 transmitted to the PV cell, normalized to the fraction transmitted at normal incidence:
 
@@ -74,7 +74,7 @@ following table:
 +-------------------------------------------+---------+-------------------------------------------+
 | :py:func:`~pvlib.iam.schlick`             | direct  | Does not take module-specific parameters  |
 +-------------------------------------------+---------+-------------------------------------------+
-| :py:func:`~pvlib.iam.schlick_diffuse`     | diffuse | Does not take module-specific parmaeters  |
+| :py:func:`~pvlib.iam.schlick_diffuse`     | diffuse | Does not take module-specific parameters  |
 +-------------------------------------------+---------+-------------------------------------------+
 
 In addition to the core models above, pvlib provides several other functions

docs/sphinx/source/whatsnew/v0.15.0.rst

@@ -1,8 +1,8 @@
 .. _whatsnew_0_15_0:
 
 
-v0.15.0 (Feb 3, 2026)
----------------------
+v0.15.0 (February 3, 2026)
+--------------------------
 
 Breaking Changes
 ~~~~~~~~~~~~~~~~

docs/sphinx/source/whatsnew/v0.15.1.rst

@@ -1,15 +1,8 @@
 .. _whatsnew_0_15_1:
 
 
-v0.15.1 (Anticipated March 2026)
---------------------------------
-
-Breaking Changes
-~~~~~~~~~~~~~~~~
-
-
-Deprecations
-~~~~~~~~~~~~
+v0.15.1 (April 21, 2026)
+------------------------
 
 
 Bug fixes
@@ -22,44 +15,42 @@ Bug fixes
   (:issue:`2645`, :pull:`2646`)
 * Update URLs in :py:mod:`pvlib.iotools.psm4` to use nlr.gov instead of
   nrel.gov. (:issue:`2701`, :pull:`2705`)
-* Fix a bug in :py:func:`pvlib.iotools.era5._m_to_cm` where meters were
-  incorrectly divided by 100 instead of multiplied, causing precipitations to be
-  underestimated by a factor of 10,000 when ``map_variables=True``.
+* Fix a bug in :py:func:`pvlib.iotools.get_era5` where conversion of
+  precipitation in meters to ``cm`` was underestimated by a factor of 10,000 when ``map_variables=True``.
   (:issue:`2724`, :pull:`2725`)
 
 
 Enhancements
 ~~~~~~~~~~~~
-* Use ``k`` and ``cap_adjustment`` from :py:func:`pvlib.pvsystem.Array.module_parameters`
+* Use ``k`` and ``cap_adjustment`` from :py:attr:`pvlib.pvsystem.Array.module_parameters`
   in :py:func:`pvlib.pvsystem.PVSystem.pvwatts_dc`
   (:issue:`2714`, :pull:`2715`)
-* Include `ross` and `faiman_rad` in the allowed models within 
+* Include ``ross`` and ``faiman_rad`` in the allowed models within 
   :py:meth:`pvlib.pvsystem.PVSystem.get_cell_temperature` (:issue:`2625`, :pull:`2631`)  
-* Accelerate the internals of :py:func:`~pvlib.solarpostion.ephemeris`. (:pull:`2626`)
-* Accelerate the intervals of :py:func:`~pvlib.pvsystem.singlediode` when
-  `method='lambertw'`. (:pull:`2732`, :pull:`2723`)
-* :py:func:`~pvlib.tracking.singleaxis` accepts negative values for 
-  parameter `axis_tilt`. (:pull:`2702`, :issue:`1976`)
+* Accelerate the internals of :py:func:`~pvlib.solarposition.ephemeris`. (:pull:`2626`)
+* Accelerate the internals of :py:func:`~pvlib.pvsystem.singlediode` when
+  ``method='lambertw'``. (:pull:`2732`, :pull:`2723`)
+* Accept negative ``axis_tilt`` values in :py:func:`~pvlib.tracking.singleaxis`. (:pull:`2702`, :issue:`1976`)
 
 
 Documentation
 ~~~~~~~~~~~~~
-* Add examples for run_model_from_poa() and run_model_from_effective_irradiance()
+* Add examples for :py:meth:`pvlib.modelchain.ModelChain.run_model_from_poa` and :py:meth:`~pvlib.modelchain.ModelChain.run_model_from_effective_irradiance`
   (:issue:`1043`, :pull:`2621`)
 * Add the following terms to the :ref:`nomenclature` page
   (:issue:`2564`, :pull:`2663`):
 
-    - :term:`clearness_index`
-    - :term:`clearsky_index`
-    - :term:`aod`
-    - :term:`aod500`
+  - :term:`clearness_index`
+  - :term:`clearsky_index`
+  - :term:`aod`
+  - :term:`iam`
+  - :term:`aod500`
 
-* Provide an overview of IAM modeling functionality in :ref:`iam`. (:pull:`2683`)
+* Add an overview of IAM modeling functionality in new documentation page :ref:`iam`. (:pull:`2683`)
 * Add AI checkbox to PR template, and auto-generate a comment on PRs
   from first-time contributors regarding AI and contributing guidelines.
   (:issue:`2617`, :pull:`2624`)
-* Update :py:class:`pvlib.pvsystem.PVSystem` docstring to state that
-  ``module_type`` is optional.
+* Clarify :py:class:`pvlib.pvsystem.PVSystem` parameter ``module_type`` is optional.
   (:issue:`2634`, :pull:`2713`)
 * Fix a broken docstring reference to ``grounddiffuse`` in
   :py:func:`pvlib.irradiance.poa_components`
@@ -74,13 +65,6 @@ Testing
   produces consistent results for vectorized and scalar inputs.
   (:issue:`2649`, :pull:`2661`)
 
-Benchmarking
-~~~~~~~~~~~~
-
-
-Requirements
-~~~~~~~~~~~~
-
 
 Maintenance
 ~~~~~~~~~~~
@@ -104,4 +88,8 @@ Contributors
 * Jean-Baptiste Pasquier (:ghuser:`pasquierjb`)
 * Rodrigo Amaro e Silva (:ghuser:`ramaroesilva`)
 * James Fulton (:ghuser:`dfulu`)
-
+* Will Holmgren (:ghuser:`wholmgren`)
+* Mark Campanelli (:ghuser:`markcampanelli`)
+* Chirag Sharma  (:ghuser:`Chirag3841`)
+* Will Hobbs (:ghuser:`williamhobbs`)
+* Adam R. Jensen (:ghuser:`adamrjensen`)

pvlib/tracking.py

@@ -45,7 +45,7 @@ def singleaxis(apparent_zenith, solar_azimuth,
         The tilt of the axis of rotation (i.e, the y-axis defined by
         ``axis_azimuth``) with respect to horizontal (degrees). Positive
         ``axis_tilt`` is *downward* in the direction of ``axis_azimuth``. For
-        example, for a tracker with ``axis_azimuth``=180 and ``axis_tilt``=10,
+        example, for a tracker with ``axis_azimuth=180`` and ``axis_tilt=10``,
         the north end is higher than the south end of the axis.
 
     axis_azimuth : float, default 0