LiSe YiJing

DOWNLOAD THE TABLE WHICH SHOWS THE CORRESPONDENCE OF HEXAGRAMS AND WEEKS (original resolution)

Chinese new year is on the the full moon day close to February 5.

New moons for 2021 see below

The first new moon is the one between January 21 until February 20. Each hexagram spans one quarter of the mooncycle: a moon-week. Four hexagrams for one complete moon-month.

The hexagram in the 5th row is the Monarch, it lasts a month. E.g. first month (moon of the Tiger): hex.11. It always starts at the same new moon as the hexagram in the first row.

new 1st full last new

"Week" corresponds to a moonphase, not a regular week. Each moon-month has 4 weeks: new to first quarter (waxing crescent), first quarter to full moon (waxing gibbeous), full to last quarter (waning crescent), last quarter to new moon (waning gibbeous).

In 2020 the first new moon is on January 24, but it depends on where you live. A day rotates around the earth, so your 25 may be when China is already on day 26, or maybe still on 24.

The new moon in 2020:
London: Jan. 24, between 9:41 PM.
Los Angeles Jan.24, 13:41 PM
Bejing Jan.25, 05:41 AM
So 25 is the official Chinese new year, but maybe not your own new-moon date.

For the new moon: https://www.lunarium.co.uk/
Below the moonphase, there is a link to find all new moons everywhere.
And here a link to all Chinese new year and new moon dates from 1900 to 2100

New moon 2021: January 13
(last moon of the old year)

Week-hexagrams 3-15-34-46, moon-hex.19. See bottom row of the table above.

All dates are GMT, so East or West from Greenwhich in England they may be a day earlier (West) or later (East).

New moon which starts the year in 2021: Feb. 12

Hexagram first moon-week: 62
Hexagram first moon-month: 11

Date notation: 1/2 is Jan.2

New moons in 2021: 3/13, 4/12, 5/11, 6/10, 7/10, 8/8, 9/7, 10/6, 11/4, 12/4

With a Raphael's ephemeris you can find all of them (and planet positions) easily.