Continuing with the theme of irregular geocentric/heliocentric equivalencies on which Newton built his absolute/relative space and motion signifying Earth and Sun based perspectives is the flaw in Huygen's reasoning based on the Equation of Time which Newton called absolute/relative time.

To reduce Watches to the right measure of dayes, or to know how much they goe too fast or too slow in 24. hours.

"Here take notice, that the Sun or the Earth passeth the 12. Signes, or makes an entire revolution in the Ecliptick in 365 days, 5 hours 49 min. or there about, and that those days, reckon'd from noon to noon, are of different lenghts; as is known to all that are vers'd in Astronomy. Now between the longest and the shortest of those days, a day may be taken of such a length, as 365 such days, 5. hours &c. (the same numbers as before) make up, or are equall to that revolution: And this is call'd the Equal or Mean day, according to which the Watches are to be set; and therefore the Hour or Minute shew'd by the Watches, though they be perfectly Iust and equal, must needs differ almost continually from those that are shew'd by the Sun, or are reckon'd according to its Motion. But this Difference is regular, and is otherwise call'd the Aequation" Huygens

Huygen's too creates an equivalency in the first sentence with the annual motion of the Sun equating with the annual motion of the Earth through the Zodiac however the Equation of Time cannot operate outside the calendar framework so when Huygens tries to squeeze the Equation of Time into 365 days 5 hours 49 minutes he fails to account for February 29th which also requires the timekeeping correction to reduce the variations in that day to a 24 hour average.

There is much to add but at least the nuts and bolts of Newton's agenda are out in the open for the first time since he conjured up his contrived agenda based on perspective equivalencies, perspectives that do not work and never had.