exmeridian observation

例句：

1. 1.The astronomers conducted an exmeridian observation to study the sun's movement across the sky.
   天文学家进行了一次日界线观测，以研究太阳穿越天空的运动。
2. 2. During the observation, they noticed that the moon was slightly ahead of its usual position.
   在观测期间，他们注意到月亮稍微领先于其通常的位置。
3. 3. The team successfully completed the exmeridian observation and provided valuable data for future studies.
   该团队成功完成了日界线观测，并为未来的研究提供了宝贵的数据。