On which date does the Sun shine directly over the Tropic of Cancer?
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Important solar positions:
• March 21 $\rightarrow$ Equator
• June 21 $\rightarrow$ Tropic of Cancer
• September 23 $\rightarrow$ Equator
• December 22 $\rightarrow$ Tropic of Capricorn
Concept:
The Sun is directly overhead at the Tropic of Cancer during the Summer Solstice in the Northern Hemisphere.
Step 1: Recall the important dates.
• March 21 -- Vernal Equinox (Sun over the Equator)
• June 21 -- Summer Solstice (Sun over the Tropic of Cancer)
• September 23 -- Autumnal Equinox (Sun over the Equator)
• December 22 -- Winter Solstice (Sun over the Tropic of Capricorn)
Step 2: Final conclusion.
Therefore, the Sun shines directly over the Tropic of Cancer on
\[
\boxed{\text{June 21}.}
\]