Step 4
Link additional fact - He won Nobel Prize for this discovery. Answer: February 28, commemorating CV Raman's discovery of Raman Effect.
Advanced Shortcut: Group days by themes - Health Days (World Health Day April 7, World AIDS Day December 1), Environment Days (World Environment Day June 5, Earth Day April 22), Education Days (International Literacy Day September 8, Teacher's Day September 5). This thematic grouping prevents confusion.
Common Mistake: Students often confuse similar-sounding days or mix up international vs national versions. For example, International Women's Day (March 8) vs National Women's Day varies by country. Always confirm whether question asks for international or national context. Another trap is confusing commemoration dates with birth/death anniversaries of personalities.