“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	scale-up scale wax Scalibregmidae scaling scaling circuit scaling factor scaling law scaling ratio scaling symmetry scallion scallop scalloped upland scalloping scalp scalped anticline scalped extrusion ingot scalpel Scalpellidae scalping chips scaly bark scaly leg scan scan converter scandent scandia

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