annual
newyear or birthdays
Annular means 'happening once a year'
Biannual describes something that occurs twice a year, once every half year.
The Earth orbits the sun once per year (which is the definition of a year).
Earth revolves around the Sun once per year.
The Earth revolves around the sun exactly once per year (that is actually the definition of a year).
This is the annual thanksgiving day parade. annual means happening once a year.
Annual
The Earth completes one orbit around the Sun in approximately 365.25 days, which is the length of a year. To account for this extra fraction of a day, we have a leap year every four years with an extra day added to February.
The proper phrase is "coming once a year." "Annually" could be used.
Quarterly means to be done, produced, completed, distributed, or occurring once every quarter of a year. It means that something occurs four times a year.
1860