月
Kun readings 🇯🇵
On readings 🇨🇳

The pictogram originally represented the quarter moon and then changed over time until it took the form we know 月.

月 in the months of the year
The meaning of many kanji like this is interesting and profound as they also develop the characteristics of the object or phenomenon they represent in their meaning.
月 also takes on the meaning of month, referring to the motor of revolution of the Moon around the Earth.
月 thus appears in all months of the year with its on reading.
Generally when two kanji join to form a word they are read according to the on reading of Chinese origin.
1 月 - January
2 月 - February
3 月 - March
4 月 - April
5 月 - May
6 月 - June
7 月 - July
8 月 - August
9 月 - September
10 月 - October
11 月 - November
12 月 - December
月日, the moon next to the sun
, indicates the day and month on a date and it is read as がっぴ (gappi
).
If we want to indicate the date of birth, we say 生年月日 (seinengappi
):
生きる kanji of
birth
andto be born
,to have origin
,to come to light
(年|と し)
year
月
month
日
day
Characteristic meanings of 月
月光, the moon placed near the light
, becomes the moonlight
, like Ludwig van Beethoven's famous sonata.

月 as a radical also takes on the meaning of flesh
and appears in many terms that indicate the anatomical parts of the organism:
(肝|か ん)臓 - The liver
肺 - The lungs
腕 - The arms
背 - The back

お正月は最古の行事だとされています。
New Year's Eve is considered the oldest holiday.
Words that contain the kanji 月
月刊
gekkan
monthly publication月間
gekkan
monthly, period of a month月給
gekkyuu
monthly salary新月
shingetsu
the New Moon満月
mangetsu
the Full Moon

月経 gekkei
the menstrual cycle. It is interesting to note that the word contains the Moon element, which with its motion around the Earth and the various phases constitutes a cyclical process.
月商 is the monthly turnover
as shown in the publication below. Rakuten, a well-known Japanese group, in 3 steps starts from a monthly turnover of 1 million yen, aims to reach 10 million yen.

Do you know Japanese udon? A type of Japanese pasta, similar to spaghetti, but thicker, more consistent and also more elastic. Among the various dishes based on udon, we have 月見うどん, udon to admire the moon which in the dish is symbolically represented by the egg yolk.

Example of kunyomi readings 🇯🇵
つき
This reading is the standard for the meaning moon
月. This reading then refers to things related to moon
and also month
.
Example of onyomi readings 🇨🇳
げつ
This reading is used in compound words related to month
: this month
, last month
, every month
.
This is also the reading for Monday
: 月曜日.
がつ
This reading is used for the names of the months of the year, and it derives from the**"Month(s) of the lunar calendar"**:
一月:
January
二月:
February
三月:
March
四月:
April
五月:
May
六月:
June
七月:
July
八月:
August
九月:
September
10月:
October
11月:
November
12月:
December