सूर्य की किरणें पृथ्वी की सतह पर पहँुचने में कितना समय (लगभग) लेती हैं? How much time (approx) is taken by sunlight to reach upto earth surface?

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सूर्य की किरणें पृथ्वी की सतह पर पहँुचने में कितना समय (लगभग) लेती हैं? How much time (approx) is taken by sunlight to reach upto earth surface?