RE: Mercury transit begins in little over an hour... for those who have the sun up :)
May 9, 2016 at 10:03 am
(This post was last modified: May 9, 2016 at 10:04 am by Alex K.)
(May 9, 2016 at 9:59 am)pocaracas Wrote:(May 9, 2016 at 9:54 am)Cthulhu Dreaming Wrote: @Alex
What sort of filter did you use for that?
A green one.
Pretty much
It's a broadband filter which cuts off long and short wavelengths in order to reduce chromatic errors in fast and not superexpensive refractors. It's basically a band pass.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition