Muhammad bin Salmah محمد بن سلمة بن عبد الله الباهلي · The Book of Eclipses

The Messenger of Allah (ﷺ) prayed when the sun was eclipsed, bowing eight times and prostrating four times.

"I heard Ubaid bin Umair say: 'Someone whom I trust'- and I think he meant Aishah- told me: There was an eclipse of the sun during the time of the Messenger of Allah (ﷺ). He led the people in prayer and stood for a very long time, then he bowed, then he stood, then he bowed, then he stood, then he bowed. He prayed two rak'ahs, bowing three times in each rak'ah. After bowing for the third time he prostrated…

The Prophet (ﷺ) said: "If there is an eclipse of the sun or the moon, pray like the last obligatory prayer you did before that."

The Messenger of Allah (ﷺ) prayed, bowing four times, and he recited loudly, and every time he raised his head he said: "Sami Allahu liman hamidah. Rabbana wa lakal-hamd (Allah hears those who praise Him, Our Lord to You be praise.)."