“ephemeris second”的概念、定义、翻译、参考文献-科学参考

单词	ephemeris second
释义	ephemeris second [ǝ`fem·ǝ·rǝs `sek·ǝnd] ^ASTRONOMY The fundamental unit of time of the International System of Units of 1960, equal to 1/31556925.9747 of the tropical year defined by the mean motion of the sun in longitude at the epoch 1900 January 0 day 12 hours.
随便看	Scyphozoa scythe Scythian stage SDA SDDC SDFL SDHT Se sea sea-air temperature difference correction sea anchor sea anemone sea arch sea ball sea bank seabeach seabed sea bottom sea breeze sea breeze of the second kind sea bridge sea buoy sea-captured stream sea cave sea channel

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