Shani is the basis for
Shanivara – one of the seven days that make a week in the Hindu calendar. This day corresponds to Saturday – after Saturn – in the Greco-Roman convention for naming the days of the week.
Shani is considered to be the most malefic planet that brings restrictions, obstacles, delays, losses, disharmony and misfortunes. Shani is part of the
Navagraha in the Hindu zodiac system. It is considered malefic, associated with spiritual asceticism, penance, discipline and conscientious work. The role and importance of the Navagraha developed over time with various influences. Deifying planetary bodies and their astrological significance occurred as early as the
Vedic period and was recorded in the
Vedas. The earliest work of astrology recorded in India is the
Vedanga Jyotisha which began to be compiled in the 14th century BCE. It was possibly based on works from the Indus Valley Civilization as well as various foreign influences. The Navagraha developed from early works of astrology over time. Saturn and various
classical planets were referenced in the
Atharvaveda around 1000 BCE. The Navagraha was furthered by additional contributions from
Western Asia, including
Zoroastrian and
Hellenistic influences. The
Yavanajataka, or 'Science of the
Yavanas', was written by the
Indo-Greek named "
Yavanesvara" ("Lord of the Greeks") under the rule of the
Western Kshatrapa king
Rudrakarman I. The Yavanajataka written in 120 CE is often attributed to standardizing Indian astrology. The Navagraha would further develop and culminate in the
Shaka era with the
Saka or Scythian people. Additionally the contributions by the Saka people would be the basis of the
Indian national calendar, which is also called the Saka calendar. The
Hindu calendar is a
Lunisolar calendar which records both lunar and solar cycles. Like the Navagraha, it was developed with the successive contributions of various works. Planet
Shani rules over both zodiac signs,
Capricorn and
Aquarius, two of the twelve constellations in the zodiac system of Hindu astrology. If
Shani rules over one's zodiac sign, it is said that one must wear a ring with a stone made of
Blue Sapphire. ==Deity==