Prayer: Relying on Scientific Principles to Know About an Eclipse
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1480
If a person attains confidence that an eclipse has occurred based on the statement of persons who know the time of eclipses by means of scientific principles, he must perform ṣalāt al‑āyāt. Furthermore, if they say the eclipse will take place at such and such time and that it will last for such and such duration, and one attains confidence in what they say, he must act according to what they say.