The "winter solstice" in the Chinese lunar calendar is the day with the shortest day and the longest night in a year. The ratio of day to night is 3:5, and there are only about how many hours in the day.
中国农历中的"冬至"是一年中白昼最短、黑夜最长的一天，这一天白昼与黑夜的时间比是3：5，这一天白昼大约只有多少小时．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">24 * (3/8)</gadget>
<output>9</output>

<result>9</result>