Do you know why there are exactly seven days in a week and who decided the order of the days? The interesting thing is that the answer is not only historical but also in the ancient wisdom of Hindu astrology.
Seven-Day Week in Hindu Astrology
According to Hindu scriptures, there are nine celestial bodies, also called Navagrahas:
Sun (Surya)
Moon (Soma)
Mars (Mangal)
Mercury (Budh)
Jupiter (Guru)
Venus (Shukra)
Saturn (Shani)
Rahu
Ketu
Out of these, Rahu and Ketu are known as shadow planets, as their effect impacts human life similarly to shadows. The other 7 planets have definite physical existence, and astrologers of the past derived this structure of the week. That's why a week contains 7 days, with each day dedicated to a specific planet. No, it's not just arbitrary; it is the blend of Astronomy, Astrology, and Mathematics.
How was the order of the week determined?
In Indian astrology, a day is divided into 24 equal parts called Horas (like the modern hours). Unlike the Western calendar, which starts a day at midnight, 12 o'clock, in Indian astrology, Hours are counted from sunrise. The day begins with sunrise. The name of the week is derived from the ruling planet of the first Hora of the day.
Hindu timekeeping is closely related to both planetary movements and the lunar cycle. The Moon's phases were traditionally observed as a natural rhythm of time, with the lunar month divided into waxing (Shukla Paksha) and waning (Krishna Paksha) cycles. Each Paksha contains 15 Tithis (lunar days).
The Hindu lunar calendar divides the month into two 15-day phases based on the Moon's visible cycle. Shukla Paksha (the waxing phase) is the bright half of the lunar cycle that occurs between the New and Full Moon. Krishna Paksha (the waning phase) is the dark half of the moon's cycle when it begins to wane again.
These play an important role in determining Hindu festivals, rituals, and ceremonies. Thus, the Hindu calendar, also known as the Panchang, combines the seven-day planetary week with the lunar Tithi system to create a comprehensive method of measuring time.
Naming the Days of the Week
Each day of the week is named after a celestial body:
The days are not arranged arbitrarily; they are determined by the relative motion of these planets and precise mathematical calculations.
Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn
Moon is the fastest-moving planet. Saturn is slow-moving. Now, if you begin counting to the right of the Sun, the 25th Hora will fall upon the Moon. We give first position to the Sun due to its importance and being the center of the system, and we get the first day of the week to be Sunday. Therefore, the second day was named "Somwar" (as the Moon is also referred to as Soma). Counting from the Moon, the 25th “Hora” corresponds to Mars, that is, Tuesday. In this sequence, Mercury became the fourth, Jupiter the fifth, Venus the sixth, and Saturn the seventh. Thus, the seven days of the week were named so. This mathematical technique provides us the seven-day week and is the perfect combination of astrology, astronomy, and mathematics.
Order of the days of the week is described through a table.
Conclusion
This 7-day week system isn't simply a man-made structure; it is a result of mathematics, astronomy, astrology, and spirituality. It indicates the influence of ancient Indian learning on the current understanding of time. So the next time you look at your calendar, reflect upon the celestial body with which each of your days is associated and how it relates to your life at large.
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