انْكَشَفَتْ فُرْجَةٌ بَيْنَ السُّحُبِ فَرَأَيْنَا نَجْمًا.
A gap opened in the clouds, so we saw a star.
خَرَجَ الطُّلَّابُ وَبَقِيَ الْمُشْرِفُ فِي الْمَرْصَدِ.
The students went out, and the supervisor stayed at the observatory.
سَجَّلُوا الْمُشَاهَدَةَ ثُمَّ رَاجَعُوا الدَّفَاتِرَ.
They recorded the observation and then, after an interval, reviewed the notebooks.
Fāʾ naturally conveys close sequence or consequence; wāw marks connection without inherently asserting sequence; thumma introduces an ordered later step, often with delay. Treating each as merely “and” obscures the distinct relations.