equation of time; time difference; jet lag
Meanings
2 senses · 5 examplesnoun
equation of time; difference between mean solar time and apparent solar time
technicalAstronomical term describing the discrepancy between clock time (mean solar time) and actual sun time (apparent solar time). The difference varies throughout the year, ranging from approximately -16 to +14 minutes.
Due to the equation of time, the actual sunset time in winter is earlier than what the clock shows.
There are four days each year when the equation of time equals zero.
noun
time difference between time zones; jet lag
Commonly refers to the hour difference between geographical regions (e.g., 'Beijing and New York have a 12-hour time difference'), or the physiological effects of jet lag after long flights (e.g., 'recovering from jet lag'). Common collocations include 倒时差 (to recover from jet lag) and 时差反应 (jet lag symptoms).
The time difference between Beijing and New York is twelve hours.
I just arrived in the US and haven't gotten over the jet lag yet.
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Many people experience jet lag after long flights.