日界线 meaning in English

[天文学] date line

If we cross the date line from the east to the west we have to omit one day .
如果越过日界线从东向西走，必需跳过一天不算。
When he crosses the date line he subtract a day from his calendar in order to compensate .
当他越过日界线时，要从他的日历上减去一天，才能得到补偿。
The tobacco steep d in rum , only i did not take so much as before , nor did i chew any of the leaf , or hold my head over the smoke ; however , i was not so well the next day , which was the first of july , as i hop d i shou d have been ; for i had a little spice of the cold fit , but it was not much
晚上，我又喝了点浸了烟叶的甘蔗酒，因为我感到，正是昨天喝了这种药酒，身体才好起来，这次我喝得不多，也不再嚼烟叶，或烤烟叶熏头。第二天，七月一日，我以为身体会更好些，结果却有穿越赤道不会失去时间。在这里，鲁宾逊也许头脑里想到的是日界线，即83国际日期变更线。