We can start the examples from the rongorongo texts with Sunday according to the weekly calendar:

Hb9-17	Hb9-18	Hb9-19	Hb9-20	Hb9-21
		Only three glyphs in the P calendar.
Pb10-29	Pb10-30			Pb10-31

Sunday means the day of the sun. Tane is the god of rationality and understanding (implying eyes to see with).

Without suggesting that Sunday in this short text refers to Tane the idea of light being a necessity for rational reasoning is implicit in the dawn phase of Sunday.

"A considerable amount of respect was paid to the sun in Maori ritual performances, during which officiating priests always faced the east. Again, on the opening of the exceedingly tapu school of learning, the ceremonial opening of the house was commenced as the first rays of the rising sun reached the house. All higher classes of knowledge are connected with the sun; they emanated from Tane." (Best)