The ocean was crystal clear wine colored before 1900. over the next
several years it turned blue. Our sun had been a deep yellow. this has
been changing over the last century.
I am now 77, and yes I remember far more yellow-ish sunsets than we have today.
   I have thought for a long time that our sun may well be a variable
star with a brightness and colour change cycle of hundreds of years,
resulting in our gradual historical climate change patterns.
  see https://www.youtube.com/watch?v=1gmVbwba8Xk
and
https://www.youtube.com/@TheBuriedArchiveYT

We do know our sun will have a sudden and dramatic change during the
tribulation period. It's quite possible that the solar changes began
in earnest about 100 years ago.
Lewis B