New Year's Day, celebrated on January 1st in the Gregorian calendar, marks the start of the year. Solar calendars like the Gregorian and Julian calendars typically begin the year near the northern winter solstice. However, cultures using lunisolar or lunar calendars observe their Lunar New Year at different times relative to the solar year.
By 1900, the difference between the Julian and Gregorian calendars increased to twelve days, due to the year 1900 not being a leap year in the Gregorian calendar while it was in the Julian.
In 1960, the Christian calendar marked New Year's Day with the Feast of the Naming and Circumcision of Jesus. This is still observed in the Anglican and Lutheran Churches.
Around 2000 BC, the ancient Babylonian calendar, which was lunisolar, started observing a spring festival and the new year during Nisan, coinciding with the March equinox.
The year 2000 was a leap year in both the Julian and Gregorian calendars.
The Martian New Year's Day of MY 37 coincided with December 26, 2022, on Earth's Gregorian calendar.
The Martian New Year's Day of MY 38 will coincide with November 12, 2024 on Earth's Gregorian calendar.