asta (1) noun "month", a division of the year (VT42:20). Pl. astar is attested (Appendix D). According to VT48:11, the basic meaning of asta is "division, a part", especially one of other equal parts: "of the year, a month or period". According to VT48:19, asta is also used in Quenya as a group suffix (see quentasta).
Quenya
Narvinyë
january
asta
month
avestalis
january
avestalis noun "January" (LT1:252; LotR-style Quenya has Narvinyë)
sinya
new
sinya adj. "new" (SI)
winya
new, fresh, young
winya (1) adj. "new, fresh, young" _(VT45:16; though the entry including this form was struck out in the Etymologies, _vinya "new" is a valid word in Tolkien's later Quenya, and it is meant to represent older winya. Compare winyamo, q.v.)
Narvinyë noun first month of the year, "January". The word seems to mean "New Fire/Sun". (Appendix D)