The correct answers are A) they observed the sun’s longitude and the moon’s phases. C) they determined the dates of the two solstices of the year. D) they mapped the constellations in the night sky.
The three ways in that Chinese developed the perpetual calendar Wan-Nien-Li were they observed the sun’s longitude and the moon’s phases, they determined the dates of the two solstices of the year, and they mapped the constellations in the night sky.
The Wan-Nien-li is a 10 000 year calendar that identifies Solar and Lunar dates for the Chinese. It serves as a conversion chart that allows scientist to convert the information to the Gregorian calendar that we use. Ancient Chinese people were intelligent and bright that could study the night sky to understand the constellations. They were astronomers that understood the moon phases and the longitude of the sun to trie to explain natural phenomenon on Earth. Those studies influenced other scientist and served as the basis of future investigations.
