The “1972 sep number of days” refers to the number of days in September 1972, which was 30. It is an example of a noun phrase, specifically a nominal group.
The “1972 sep number of days” is relevant to anyone who needs to track the passage of time, such as historians, scientists, or project managers. It can also be used to calculate the number of days between two dates or to determine the length of a particular period of time.
