We do actually mean Aries 1st. This is because - by the Zodiac calendar - Aries is the first sigm when you go in order which signs displayed. (Check here: http://en.wikipedia.orgnwiki/Zodiac#The_twelve_signs )
New Years Vigil would then be moved to March 20th (the last day of Pisces!) instead of Dec 31st - This is a recent change we made due to it seeming to make more sense for the IC calendar to coincide with the zodiac calendar that we hadn't fully thought through previously. Regarding Faram's Mass, we're not sure why it was originally written as the 21st. Please use the current in game calendar for the month of Dec for the appropriate dates for Faram's mass at this time, we apologize for the typo that appeared back on the initial calendar.
Thanks, and as always, let us know if you have any additional questions! Emi Mods~