WHAT DOES HWGACOR RTP MEAN?

" An experiment using a h2o-loaded glass sphere was executed and al-Farisi showed the extra refractions due to the glass can be dismissed in his model.[seventy four][c] As he pointed out in his Kitab Tanqih al-Manazir (The Revision on the Optics), al-Farisi employed a sizable obvious vessel of glass in the shape of the sphere, which was crammed wit