DOC: fix broken links (NREL, EnergyPlus, git-scm, Wikipedia ΔT)

Author: dgowdaan-cmyk

docs/sphinx/source/user_guide/getting_started/installation.rst

@@ -138,7 +138,7 @@ Follow these steps to obtain the library using git/GitHub:
 Please see GitHub's
 `Forking Projects <https://guides.github.com/activities/forking/>`_,
 `Fork A Repo <https://help.github.com/articles/fork-a-repo/>`_,
-and the `git-scm <https://git-scm.com/documentation>`_ for
+and the `git-scm <https://git-scm.com/doc>`_ for
 more details.
 
 .. _setupenvironment:

pvlib/iotools/epw.py

@@ -214,7 +214,7 @@ def read_epw(filename, coerce_year=None):
     ----------
 
     .. [1] `EnergyPlus documentation, Auxiliary Programs
-       <https://energyplus.net/documentation>`_
+       <https://energyplus.readthedocs.io/en/latest/>`_
     '''
 
     if str(filename).startswith('http'):
@@ -259,7 +259,7 @@ def _parse_epw(csvdata, coerce_year=None):
         A pandas dataframe with the columns described in the table
         below. For more detailed descriptions of each component, please
         consult the EnergyPlus Auxiliary Programs documentation
-        available at: https://energyplus.net/documentation.
+        available at: https://energyplus.readthedocs.io/en/latest/.
 
     metadata : dict
         The site metadata available in the file.

pvlib/solarposition.py

@@ -180,7 +180,7 @@ def spa_c(time, latitude, longitude, pressure=101325., altitude=0.,
     redefined by Python>=3.5. This issue is
     `Python bug 24643 <https://bugs.python.org/issue24643>`_.
 
-    .. [2] Delta T: https://en.wikipedia.org/wiki/%CE%94T_(timekeeping)
+    .. [2] Delta T: https://en.wikipedia.org/wiki/%CE%94T_(timekeeping%29
 
     .. [3] USNO delta T: https://maia.usno.navy.mil/products/deltaT
 

pvlib/spectrum/irradiance.py

@@ -47,8 +47,8 @@ def get_reference_spectra(wavelengths=None, standard="ASTM G173-03"):
     For global spectra, it is about 1000.37 W/m².
 
     The values of the ASTM G173-03 provided with pvlib-python are copied from
-    an Excel file distributed by NLR, which is found here [2]_:
-    https://www.nlr.gov/grid/solar-resource/assets/data/astmg173.xls
+    an Excel file distributed by NREL, which is found here [2]_:
+    https://www.nrel.gov/grid/solar-resource/spectra-am1.5
 
     Examples
     --------
@@ -79,7 +79,7 @@ def get_reference_spectra(wavelengths=None, standard="ASTM G173-03"):
     .. [1] ASTM "G173-03 Standard Tables for Reference Solar Spectral
        Irradiances: Direct Normal and Hemispherical on 37° Tilted Surface."
     .. [2] “Reference Air Mass 1.5 Spectra.” NLR.
-       https://www.nlr.gov/grid/solar-resource/spectra-am1.5.html
+       https://www.nrel.gov/grid/solar-resource/spectra-am1.5
     """  # Contributed by Echedey Luis, inspired by Anton Driesse (get_am15g)
     SPECTRA_FILES = {
         "ASTM G173-03": "ASTMG173.csv",