The days of the Tamil Calendar relate to the celestial bodies in the solar system: Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn, in that order. The week starts with Sunday.

This list compiles the days of the week in the Tamil calendar:
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For Tamils the each day begins at the sun set and that is why it is being said on the evening of Thursday it was told it is the meeting point of Thursday and Friday which is why loans are to be eschewed during this period onwards till Friday wanes off. In this regard Parthimar Kalingar has done extensive research to prove the beginning of a Tamil day

महिने
सोहळे-उत्सव
आठवडे
सणवार