"an advanced version of what time-keeping system was developed by the ancient maya in or obelisk

Maya calendar is referred to as a calendar system that is used in Mesoamerica and other moderns communities near Guatemalan highlands.

Explanation:

Maya calendar is referred to as a calendar system that is used in Mesoamerica and other moderns communities near Guatemalan highlands.

Maya developed this system of calendars to keep the track of time periods which Maya termed as Long calendars. The purpose behind keeping track of a long period is to track the average world age by evaluating a great circle which is equivalent to 13 baktuns.

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.

your question is incomplete

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