A kind of prayer.
Useful infromation: Namaz-e-Ayaat whose methods will be explained later, becomes obligatory due the following four things:
Solar Eclipse
Lunar Eclipse
The prayer becomes Wajib even if the moon or the sun are partially eclipsed, and even if they do not engender any fear.
Earthquake, as an obligatory precaution, even if no one is frightened.
Thunder and lightning, red and black cyclone and other similar celestial phenomena, which frightens most of the people; similarly for the terrestrial events like receding sea water, or falling mountains which engender fear in these circumstances, as per recommended precaution, Namaz-e-Ayaat be offered.