Fix two broken links

Closes #8518

Author: seisman

doc/rst/source/reference/supplemental-packages.rst

@@ -185,7 +185,7 @@ Footnotes
    three-dimensional bodies of arbitrary shape, *Geophysics, 25*, 203–225.
 
 .. [28]
-   `Timothy J. Henstock <http://www.southampton.ac.uk/oes/research/staff/then.page>`_,
+   `Timothy J. Henstock <https://www.southampton.ac.uk/people/5wy8gd/professor-tim-henstock>`_,
    University of Southampton
 
 .. [29]

doc/rst/source/solar.rst

@@ -183,7 +183,7 @@ Set up a clip path overlay based on the day/night terminator::
 References
 ----------
 
-Code from the Excel Spreadsheets in http://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html
+Code from the Excel Spreadsheets in https://gml.noaa.gov/grad/solcalc/calcdetails.html.
 
 Notes
 -----