The Rigveda is the oldest and most important of the four Vedas, containing a collection of hymns and prayers addressed to various deities.

The Samaveda is primarily concerned with music and melodies used in religious rituals and ceremonies.

The Yajurveda contains instructions and formulas for performing various rituals and ceremonies, including sacrifices and offerings.

The Atharvaveda is primarily concerned with magic, healing, and protective spells, as well as practical knowledge and remedies.

The Rigveda contains numerous hymns and verses that refer to celestial bodies and astronomical phenomena, making it the earliest record of astronomical observations in India.

The Nakshatras are lunar mansions used in Vedic astrology to mark the position of the Moon in its orbit around Earth.

The Yajurveda contains the Taittiriya Samhita, which includes detailed descriptions of the solar system, planetary movements, and astronomical phenomena.

Rta in Vedic cosmology represents the order, harmony, and regularity of the universe, including the movements of celestial bodies and the cycles of nature.

The Rigveda contains numerous hymns dedicated to Surya, the Sun god, praising his power and significance in the universe.

Brahman in Vedic cosmology represents the ultimate reality, consciousness, and the source of all existence, encompassing the entire universe and beyond.

The Rigveda contains numerous hymns dedicated to Chandra, the Moon god, praising his beauty, influence, and association with the night sky.

Maya in Vedic cosmology represents the illusion and impermanence of the material world, emphasizing the distinction between the true reality of Brahman and the transient nature of physical existence.

The Rigveda contains hymns dedicated to Sirius, known as 'Agastya' or 'Rohini', praising its brilliance and significance in the night sky.

Karma in Vedic cosmology represents the law of cause and effect, emphasizing that one's actions and intentions have consequences, shaping their destiny and future experiences.

The Rigveda contains hymns dedicated to Venus, known as 'Shukra' or 'Bhrigu', praising its beauty and association with love, fertility, and prosperity.