In Judaism, the New Moon ushers in a new month

Rosh Chodesh or Rosh ḥodesh (Hebrew: ראש חודש‎; trans. Beginning of the Month; lit. Head of the Month) is the name for the first day of every month in the Hebrew calendar, marked by the appearance of the new moon. The new moon is marked by the day and hour that the new crescent is observed. It is considered a minor holiday, akin to the intermediate days of Passover and Sukkot.^[1]

Islamic culture

Arabic · Azeri
Indo-Islamic · Iwan
Moorish · Moroccan · Mughal
Ottoman · Persian · Somali
Sudano-Sahelian · Tatar

In many countries, Teachers' Days are intended to be special days for the appreciation of teachers; World Teachers' Day is celebrated across the world on October 5. Ever since the importance of teachers has been recognized by UNESCO, by adopting the “Recommendation concerning the status of teachers”, World Teachers' Day has been celebrated annually.^[1] This includes celebrations to honor the teachers for their special contribution in a particular field area or the community in general.

The idea of celebrating Teacher's Day took ground independently in many countries during the 20th century; in most cases, they celebrate a local educator or an important milestone in education (for example, Argentina commemorates Domingo Faustino Sarmiento's death on September 11 since 1915,^[2] while India celebrates Dr. Sarvepalli Radhakrishnan's birthday on September 5 since 1962^[3]). These two factors explain why almost all countries celebrate this day on different dates, unlike many other International Days.