During the observation moment both stars were situated westwards from the Sun, the ecliptical longitude difference of the Sun and star X was equal to 100°.
观测到时刻，两颗星都太阳的西面，X星和太阳之间的黄经为100度。
During the observation moment both stars were situated westwards from the Sun, the ecliptical longitude difference of the Sun and star X was equal to 100°.
观测到时刻，两颗星都太阳的西面，X星和太阳之间的黄经为100度。
明：以上例
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