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A set of documented functions for simulating the performance of photovoltaic energy systems.

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Several pvlib functions take an index as one of the input parameters, however, it is inconsistent whether this parameter is called `times` or `time`. I think we should document the...

Improve "contributing" guidelines on how to find parameter names and their units. - [x] Closes #2205 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [ ] Adds description...

**Describe the bug** `pvsystem.sapm_spectral_loss` was deprecated since v10.0 but I could not find any PRs to remove it in a future version (12.0?) **To Reproduce** Steps to reproduce the behavior:...

- [X] Closes #2243 - [X] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [X] Tests ~added~ removed - [ ] Updates entries in [`docs/sphinx/source/reference`](https://github.com/pvlib/pvlib-python/blob/main/docs/sphinx/source/reference) for API changes. - [...

**Describe the bug** As reported by @kdebrab in this https://github.com/pvlib/pvlib-python/pull/717#pullrequestreview-2274231371 comment **Expected behavior** the line is meant to start with `f_gnd_beam =` and clip it at max zenith so values...

bug
easy
help wanted
good first issue

**Is your feature request related to a problem? Please describe.** The `spectrum.spectral_factor.*` functions offer model coefficients but pvlib currently has no functionality for users to derive model coefficients from their...

enhancement
api

- [x] Related to #1253 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [x] Tests added - [x] Adds description and name entries in the appropriate "what's new"...

documentation
api

**Describe the bug** With #2055, `pvlib.solarposition.sun_rise_set_transit_spa` sunrise etc times are in the next/previous day, depending on the time zone of the input timestamps and how close to midnight the timestamps...

bug

**Is your feature request related to a problem? Please describe.** As of now, units in the whole documentation are written with the own developer style, and there is no place...

**Is your feature request related to a problem? Please describe.** There is a mix of citation styles currently used in the documentation, both between pages and sometimes on the same...

documentation