Time corresponding to 1392 complete years, to the last day of December.
23 second and 12 first [23 x 60 + 12 x 1] years
and the last day of December in 1393: 23 second and 13 first, etc.

table of the reduction of extended [Julian] years in [base] 60 [converting numbers of years to numbers of days]

motus [position] of the deferent centre of the Moon at annual intervals
at the era of Christ [0 years], at noon on the last [day] of December at London

let it be checked

radix [starting value] at the era of Christ [0 years], noon on the last [day] of December at London
radices for 1393 complete years, the last day of December at midday