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.
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