It means that solstice in themid of summer at the time of the longest day about 21 st June in the Northern hemisphere and 22 nd December in Southern hemisphere. Hope I helped u.. Plz mark as the BRAINLIEST answer...
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On 21st june the tropic of cancer receives direct rays of the sun as the north pole tilts towards it. as the sun's rays fall directly at the tropic of cancer a larger portion of the northern hemisphere gets light. therefore it is summer in the northern hemisphere with longest days and shortest night.