# Draft proposals for calendar reform

Annis | ||

365
$\frac{1}{4}$
^{d.}
| − 11′. 13″. 92 | |

365 $\frac{1}{4}$ | − 11′. 31″. 2 | |

365 $\frac{1}{4}$ | − 10′. 56. 64 | |

365 $\frac{1}{4}$ | − 10′. 48″ | Ann. Greg |

10′. 48″ // 10′. 56″. 64 // 11′. {illeg}″ {illeg} 13′. 92 // 11′. 31″. 2 facit in annis 5000 facit 37 $\frac{1}{2}$ , 38, 39, 40 dies respective.

## Observationes Hipparchi

− 7.′ 14″ æq. t.

And at y^{e} end of every 500 years the larger period of \lunar/ months w^{ch} shall or should be then running shall contein only 45 m lunar months & consist of \the/ three lesser periods each of w^{ch} shall \of w^{ch} that larger period consists shall each of them/ contein only 15 \lunar/ months, the two last months of the \two/ periods {illeg} \co conteining/ 17 months being \then/ omitted.

The advantage of this Calendar above y^{e} Gregorian \in respect of the solar y/ is that in y^{e} Gregorian the Solar year errs a day in 5000 years in this it errs a day & by that error recedes from y^{e} state it had in y^{e} age of Christ, in this it errs a day in 10000 years & by that error approaches the state it had in y^{e} age of Christ so that in 30000 years it will a the equinox will fall on y^{e} 24^{th} of March as it did in y^{e} age of {illeg}|C|hrist & in 110000 years the beginning of Ianuary will fall on y^{e} winter solstice as it ought to do. Also y^{e} recconing by 500, 1000, 1500 &c runs in rounder \& fewer/ numbers then that by 400, 800, 1200, 1600. And tho y^{e} Kalendars differ yet y^{e} stiles \they/ will agree \in stile/ for 700 years to come.

The advantage in respect of y^{e} Lunar year is that much greater. For \in/ the Gregorian Kalendar the full Moon on w^{ch} Easter depends requires is not to be found w^{th} out y^{e} help of \three or four/ Tables, & when you have that full moon there is no rule in that Kalendar for finding y^{e} other full moons & y^{e} new moons throughout y^{e} year. But in this Kalendar \all/ the new & full Moons are found perpetually without any Tables at all or any other recconing then y^{e} continuall addition of y^{e} 2|3|0 & 29 days w^{ch} is so \very/ easy a work that any Novice may perform it. And besides this rule is exacter then y^{e} Gregorian for that errs thre hours & t in 2|3|9 years this errs but 3 hours in five hundred years.

^{[Editorial Note 1]}<3r>

The advantage of this Kalendar above y^{e} Gregorian in respect of y^{e} solar year is that y^{e} solar year in y^{e} Gregorian errs a day in 5000 years & by that error recedes from y^{e} state it had in y^{e} age of Christ, in this it errs a day in 10000 years & by that error approaches the state it had in y^{e} age of Christ so that in 30000 years the equinox will fall on y^{e} 24^{th} of March as it did in y^{e} age of Christ & in 110000 years the beginning of Ianuary will fall on y^{e} winter solstice as it ought to do. Also the recconing by 500, 1000, 1500 &c runs in rounder & fewer numbers then that by 400, 800, 1200, 1600 &c. And tho y^{e} Kalendars differ yet they will agree in stile for 700 years to come.

The advantage in respect of y^{e} Lunar year is much greater. For in y^{e} Gregorian Kalendar y^{e} full Moon on w^{ch} Easter depends is not to be found w^{th}out the help of three or four Tables, and when you have that full moon there is no rule in that Kalendar for finding the other full moons & y^{e} new moons throughout y^{e} year. But in this Kalendar all y^{e} new & full moons are found perpetually w^{th}out any Tables or any other recconing then y^{e} continual addition of 30 & 29 days alternately w^{ch} is so very easy a work that any Novice may perform it. And besides this rule is much exacter then the Gregorian for that errs three hours in 39 years this errs but 3 hours in 500 years, & may be corrected evey {sic} 500 years to keep it exact.

^{[Editorial Note 1]} Folio 2r is blank. A series of calculations on f. 2v is here omitted from the transcription.