The summer solstice in China lunar calendar is the longest day and the shortest night in a year.
The ratio of 20 kg: 0.2 ton is (1: 10). The "Summer Solstice" in China lunar calendar is the longest day and the shortest night in a year. On this day, the ratio of day time to night time in Beijing is 5: 3. How many hours are day and night? 24/8*5= 15 day 24/8*3=9 nights