The Atharvaveda is one of the four Vedas, and it contains references to comets as 'ketu'.

The Rigveda mentions a comet called 'Dhumketu', which is associated with the god Agni.

The Manusmriti, an ancient legal text, describes comets as 'portents of evil' and associates them with various calamities.

The Mahabharata mentions a comet called 'Ketu', which is associated with the god Rahu.

The Brihat Samhita, written by Varahamihira, contains a detailed description of the appearance of a comet, including its color, shape, and tail.

The Vishnu Purana mentions a comet called 'Rohini', which is associated with the god Vishnu.

The Rigveda describes comets as 'messengers of the gods', and associates them with various deities.

The Bhagavata Purana mentions a comet called 'Ardra', which is associated with the god Shiva.

The Surya Siddhanta contains a list of comets that were observed in ancient times, along with their positions and dates of appearance.

The Ramayana mentions a comet called 'Punarvasu', which is associated with the god Rama.

The Atharvaveda describes comets as 'celestial brooms', and associates them with the sweeping away of evil spirits.

The Arthashastra mentions a comet called 'Dhumketu', which is associated with the god Agni.

The Brihat Samhita contains a description of the effects of comets on human life, including their association with various natural disasters and political upheavals.

The Yajurveda mentions a comet called 'Mrigashira', which is associated with the god Soma.

The Atharvaveda describes comets as 'signs of the end of the world', and associates them with various apocalyptic events.