Imam Maalik مالك بن أنس بن مالك بن أبي عامر · The Book of Eclipses

The Messenger of Allah (ﷺ) prayed on the day the sun was eclipsed, bowing four times in two rak'ahs and prostrating four times.

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 Prophet (ﷺ) went out and the sun became eclipsed. We went out to the apartment and some women gathered around us. The Messenger of Allah (ﷺ) turned to us, and that was at the time of the forenoon. He stood for a long time, then he bowed for a long time, then he raised his head and stood for a shorter time than the first, then he bowed for a shorter time than the first, then he prostrated. Then…