Keeping Your Eyes Safe When Observing the Sun
Don't ever look directly at
the Sun through a telescope or in any other way, unless you have the proper filters!
For more details, see
Protective Filters for Direct Visual Observation of the Sun Technical
You can permanently damage your eyes by looking at a solar eclipse BEFORE totality. See
Eye Safety During
"Sunlight is very bright, and looking directly at the Sun with
the naked eye for brief periods can be painful, but is generally not hazardous.
However, there are lots of caveats. See
Article on Sun Observation and Eye Damage
Did Galileo Go Blind by
Observing the Sun? Nope. Galileo understood eye safety.