单词	equation of time
释义	equation of time noun phrase : the difference between apparent time and mean time usually expressed as a correction which is to be added to apparent time to give local mean time The Equation of Time is the difference between your local apparent solar time, when the Sun crosses your meridian, and local mean solar time, which is the average rate of solar time used in clocks. Because the Earth travels at varying speeds as it traverses its elliptical orbit, the difference can be as much as 16 minutes. Kathleen Hill Zeller Word History First Known Use 1645, in the meaning defined above
随便看	pollen count pollen fever pollen grain pollen mass pollen mother cell pollen parent pollen plate pollen profile pollen sac pollen tube pollen-lethal pollenate pollenated pollenates pollenatia pollenating pollenation pollenations pollened pollening polleniser pollenization pollenize pollenizer pollenizers

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