The exact number of Earth’s rotation is 365.2422 days, so we add a leap day every four years, and this year’s leap day is February 29. But because the transit time is not exactly 365.25 days, the calendar also needs to be fine-tuned to handle a little extra time: if the year can be divisible by 100 but not 400, then there is no leap year, such as 1900 is not a leap year, and 2100 is not.
A similar situation exists on Mars, where the year is 668.6 Mars Days, so the Mars calendar year lasts only 668 days, and it takes a leap day to deal with that 0.6 days, otherwise the seasons will soon be inconsistent.
Space law expert Thomas Gangale created the Darian Mars calendar in 1985, dividing the year into 24 months, 27 or 28 Mars days per month.
To keep the calendar in line with the Martian season, Gangale proposes that there be 668 Mars days in even years (excluding years that can be excluded by 10 years), 669 Mars days, and an average of 668.6 Mars days. This is not the only calendar that can meet this average.
Retired NASA scientist Dr. Michael Allison has proposed another calendar that will keep a similar calendar to the Earth calendar for 12 months, but add 10 months, using the names of renowned astronomers or sci-fi authors Johannes Kepler and Brad Bury. the name of the word. He proposes that there are 3 leap days with 3 leap days that can be divisible, and 668 days for other years.