Periods are subdivided into periods of time know as epochs.
A degree of longitude and latitude is further subdivided into minutes and seconds (units of arc, not time).
Era
Eras are divided into periods.
2/4 3/4 4/4 and 3/8 are the simple time signatures.
Route and time
the articles are subdivided into ten sections
There are no certain amount of time signatures, but the most common time signature is 4/4. There are other common time signatures such as 3/4, 2/2, 6/8, and 2/4, but basically any number can be used as the top number. There are songs in 5/4, 7/4, 11/4, 15/8 etc....
4
OG all the time
Crotchets are also known as quarter notes. In simple time signatures, a quarter note gets one beat. In compound time signatures, the unit beat is a dotted quarter note.
Is the thorax of the human body subdivided superficially into four quadrants?