月 moon, month 월
The traditional Chinese calendar is based on the lunar cycle, so the character 月 can translate to both “moon” and “month”. The curve is because originally the picture was a crescent moon.
In Korean, months are simply the month plus number. For example, January is month 1, February is month 2, March is month 3, etc. 1월, 2월, 3월, etc. So in Hanja, it is just 一月, 二月, 三月, etc.
June combines the number 六 (six) and the character 月 (moon).
Mandarin Chinese numbers: 1 一 2 二 3 三 4 四 5 五 6 六 7 七 8 八 9 九 10 十
Sino-Korean Numbers: 1 일 2 이 3 삼 4 사 5 오 6 육 7 칠 8 팔 9 구 10 십
Months: 1 January 일월 2 February 이월 3 March 삼월 4 April 사월 5 May 오월 6 June 유월 * 7 July칠월 8 August 팔월 9 September 구월 10 October 시월 * 11 November 십일월 12 December 십이월
When you put two moons together, you get friend.
When you put sun and moon together, you get bright.
Notice moon has 4 strokes: a down left stroke, a turning stroke with a hook, and two horizontal strokes.
If you are interested in hanja, check out Everything you ever wanted to know about hanja. Plenty of Koreans have told me that learning hanja is not necessary. I simply find learning a few simple Chinese characters to be intellectually stimulating.