Corrections in red.  Stylistics and comments in blue.

Solar Eclipse      Capitalize the first, last, and "important" words of a title.  Articles and prepositions are not considered to be "important" words for the purpose of capitalization.

I watched a solar eclipse today.  It was amazing!  I took two СВ ?? [1] and looked through them. The picture was very sharp. Half of the sun was hidden behind the moon. It is very rare occurrence, and it was something great to see.  I saw an eclipse some years ago, but it was not as full.

[1]  Sorry.  I have no idea what a "CB" is.  And if there are two, it should probably be "two CBs."

Errors in Red & comments/suggestions in blue

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Solar eclipse - 

I have been watching watched a the (since solar eclipse on particular day is a unique & well known event, the is the suitable article) is sun solar eclipse this day today. It was amazing! I took two СВ (I don't know what's CB/CD. Do you mean telescopes?)  and looked (observed is a more suitable word here) through them. The picture (This depends on what you mean by CB/CD. If it's telescope, view is the word to be used) was very sharp. The sun was hidden behind the moon for a half half an hour. It is a very rare thing phenomenon (or occurance), and it is was great that I saw it to see. I saw had seen an eclipse some years ago, but it was not so big (Big isn't the correct word. Do you mean to say long/grand?)