Our calendar except for its starting year is already based on Star data. We are using a solar “Star” calendar, which was created with a shadow-measuring Observatory like Stonehenge, which dates back 4,500 years.
The calibrations were done in four main parts, called the four Seasons. The first starts with the shortest day called “winter 12/21.” The spring starts with the equal ox 3/21, then the longest Day “summer 6/21,” followed by another equal day “fall 9/21.”
There are 365 ¼ days in a year, making each season about 91 days long. The Months are the counting of the Moon's cycles. The moon takes approximately 28 Days to rotate around the Earth. However, it was considered more important to make the months fit into the four seasons so the number of days in the months were changed to accommodate the solar seasons.

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