复数： ephemerides

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Astronomy , ephemeris tables , celestial mechanics .

天文学、星历表、天体力学。

Summary : pocket stars is an astronomy application featuring an integrated star chart , ephemeris , and celestial navigation calculator .

综述:特色应用袖珍星星是一个综合天文星图、星历、天文导航计算器.

In his free time , banneker wrote the pennsylvania , delaware , maryland , and virginia almanac and ephemeris .

闲暇之时，班尼卡撰写有关宾州、德拉瓦、马里兰和维吉尼亚的农民历及星象历书。