Make '' writable by PHP for this script to operate properly.
<pre>
WU-satellite-animate.php - V1.01 - 11-Jan-2024
using 'https://s.w-x.co/staticmaps/wu/wu/satir1200_cur/usanc/regionalIR.json' for query
now='2026-05-18 03:19:43 UTC' page cached='2026-05-18 03:19:43 UTC' (0 seconds ago)
forceRefresh=true
loading ./cache/WUregion-nc-IR.txt from
  'https://s.w-x.co/staticmaps/wu/wu/satir1200_cur/usanc/regionalIR.json'
curl fetching 'https://s.w-x.co/staticmaps/wu/wu/satir1200_cur/usanc/regionalIR.json'
HTTP stats:  RC=200 dest=151.101.130.133 port=443 (from sce=172.17.0.8)
      Times: dns=0.126 conn=0.137 pxfer=0.166 get=0.059 total=0.226 secs
unable to open ./cache/WUregion-nc-IR.txt for writing 1253 bytes.. cache not saved
html loading finished
--Sorry.  Unable to write ./cache/WUregion-nc-IR.txt to ''.
</pre>