Use observation for calendaring ; Emphasize importance of knowledge & education ; Utilize senses & observe nature ; Prefer simplicity over complexity when needed .

The hadith narrated by Ibn 'Umar states that Prophet Muhammad (PBUH) taught that Muslims should use observation of the moon to determine their calendar rather than using astronomical calculations. This is because Muslims are an unlettered Ummah and do not have access to such complex calculations. To demonstrate this concept, he showed it three times as twenty-nine days in a month. This hadith teaches us about how important it is to observe nature and use our senses in order to understand our environment better. It also shows us how we can use simple methods instead of complex ones when necessary. Furthermore, this hadith emphasizes the importance of knowledge and education in Islam as well as its emphasis on practicality over theoretical knowledge.