The Memorial Blowing Of Trumpets
Today is the memorial feast of trumpets. This is a holy day detailed in the book of Leviticus, 23rd chapter.
This holy day officially starts at the evening before the actual date of the holy day.
This day is also a "double-stacked Sabbath". Today is also the weekly Sabbath (7-day count).
For the fall feast days, we observe the start of the biblical months at the new moon (first sliver of light [2+% luminosity]) following the fall equinox.
Leviticus 23:23-25