In 1915 while the Imperial Trans-Antarctic Expedition's vessel Endurance was icebound in the Weddell Sea, lunar occultation timings were carried out in order to rate the chronometers and thereby find longitude. The original observations have been re-analysed using modern lunar ephemerides and catalogues of star positions. The times derived in this way are found to differ by an average of 20 s from those obtained during the expedition using positions given from the Nautical Almanac and introduces an additional offset of the true positions to the east of those recorded in the log.

中文翻译：

---

计时误差不确定性对沙克尔顿船只经度、耐力的影响

1915 年，当帝国横贯南极探险队的船只耐力号在威德尔海被冰封时，进行了月球掩星计时，以便对计时器进行评级，从而找到经度。使用现代月球星历表和恒星位置目录对原始观测结果进行了重新分析。发现以这种方式得出的时间与探险期间使用航海年历给出的位置获得的时间平均相差 20 秒，并且引入了日志中记录的真实位置向东的额外偏移量。