Question

Why seven was such an auspicious number in ancient times ?

Answer 1

seven was an auspicious no in ancient time because it was believed it was the no of God's.
cause rainbow has 7 colours, 7 days a week, and so on.

Answer 2

Not only in ancient culture, number seven is considered as a luck number in modern days too.

Chinese compared the number seven to life as its pronunciation was more similar to the Chinese pronunciation of life.

Number seven is considered as a good omen in means of relationship.

According to Buddhism, number seven is considered as a number of ascent.

In Christianity, God is represented by the seventh ray and the center of creations  

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