Happy New Year on Mars! NASA rings in Red Planet year 37

"The first Mars flyby was by Mariner 4 on July 14, 1965, but for the Red Planet new year scientists start counting from when the planet reached its northern spring equinox in 1955. "An arbitrary point to begin, but it’s useful to have a system," NASA officials wrote on Twitter."
Dec 27, 2022
Thanks for the reply. I know they claim it's arbitrary, but do you think there is a reason they started counting from that year?