JulianDate
new Cesium.JulianDate(julianDayNumber, secondsOfDay, timeStandard)
Core/JulianDate.js 207
Represents an astronomical Julian date, which is the number of days since noon on January 1, -4712 (4713 BC). For increased precision, this class stores the whole number part of the date and the seconds part of the date in separate components. In order to be safe for arithmetic and represent leap seconds, the date is always stored in the International Atomic Time standard TimeStandard.TAI.
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Cesium的JulianDate类用于表示天文上的儒略日期,精确到秒。该类存储日期的整数天数和秒数部分。儒略日期从公元前4712年1月1日正午开始计算。成员包括静态属性leapSeconds(闰秒列表)、dayNumber(天数)和secondsOfDay(当天秒数)。提供的方法包括addSeconds(加秒)、fromDate(根据日期创建)和clone(克隆实例)。
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