On Tuesday, April 11, 2017 at 6:59:19 AM UTC-6, Gerald Kelleher wrote:
founded on the calendar system which apportions the natural 1461 rotations
within 4 consecutive orbital circumferences into the familiar format of 365/366
days. It is therefore immediately obvious that a year doesn't equate directly to
one orbital circuit even if presently nobody makes this distinction.

A _calendar_ year, which may be 365 or 366 days long, indeed doesn't equate
directly to "one orbital circuit", if by that you mean a sidereal year of
365.25636 days. It doesn't even directly equate to the *tropical* year of
365.2422 days, which is what the calendar year is intended to approximate to.

But it's not clear what precisely is your point.

John Savard