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

أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى عِنْدَ كُسُوفِ الشَّمْسِ ثَمَانِيَ رَكَعَاتٍ وَأَرْبَعَ سَجَدَاتٍ وَعَنْ عَطَاءٍ مِثْلُ ذَلِكَ  

The Prophet ﷺ prayed when there was an eclipse. He recited then he bowed, then he recited then he bowed, then he recited then he bowed, then he recited then he bowed, then he prostrated, and he did the second rak'ahs in same fashion.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ صَلَّى فِي كُسُوفٍ فَقَرَأَ ثُمَّ رَكَعَ ثُمَّ قَرَأَ ثُمَّ رَكَعَ ثُمَّ قَرَأَ ثُمَّ رَكَعَ ثُمَّ قَرَأَ ثُمَّ رَكَعَ ثُمَّ سَجَدَ وَالأُخْرَى مِثْلُهَا