Earth celebrates several new years— according to the communities and cultures. Chinese have their own new year, westerns have their own, and so have the south asian like Nepal. I’m from Nepal, and there January 1 is not the equivalent date when we celebrate our New Year. And, that might be the case for other places too(Not sure about that tho).
So, which new year is the exact day when the Earth completed one revolution around the Sun?
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The other comments have already explained that you can start a revolution around the Sun on any day.
I went ahead and looked up the Nepalese calendar, which I have no prior knowledge of, and a brief glance tells me that it’s a lunisolar calendar…based on the phases of the Moon. The Moon has nothing at all to do with the Earth’s year, so generally speaking, lunisolar calendars are not a very good way of keeping track of Earth’s orbit around the Sun. There are leap years and intercalary periods to make up for this, so over long periods it isn’t an inaccurate calendar, but from one average New Year’s Day to the next, your calendar doesn’t sound like it’s a full trip around the Sun. The Gregorian calendar technically isn’t either, but it gets as close as the Earth’s rotation allows.
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