Social Studies

Julio Peters

23 September, 18:17

Instructions:Select all the correct answers.

In what three ways did the Chinese develop the perpetual calendar wan-nien-li?

1. They observed the sun's longitude and the moon's phases.

2. They used measurements from a sundial and a water clock.

3. They determined the dates of the two solstices in a year.

4. They mapped the constellations in the night sky.

5. They surveyed citizens about how many days there should be in a year.