# Computations used in the Pied Piper report (reproducible)

> **Note.** The weekday and feast computations convert the tradition's year and feast day (attested no earlier than c. 1430–50) into calendar terms. They are conditional on the tradition and are not independent evidence about 1284. The distances test whether a proposed itinerary is physically possible; they are not evidence that any itinerary was taken.

## Weekday of 26 June 1284 (Julian calendar)
Meeus JDN for Julian calendar: JD 2190215.5 -> weekday Monday. (Sanity check: Julian 19 Dec 1999 = Gregorian 1 Jan 2000 = Saturday, reproduced.)
Easter 1284 (Julian computus): 9 April 1284. So 26 June 1284 is 11 weeks after Easter; Pentecost was 28 May, Corpus Christi 8 June, St John the Baptist (Midsummer) Saturday 24 June, SS John and Paul Monday 26 June.

## Distances from Hamelin (great-circle, x1.25 for road, 25 km/day walking column)
Coppenbrügge (Koppenberg)   13 km  (~17 km road)
Stendal (Altmark)          179 km  (~224 km; ~9 days)
Pritzwalk (Prignitz)       223 km  (~279 km; ~11 days)
Prenzlau (Uckermark)       332 km  (~415 km; ~17 days)
Stettin                    379 km  (~474 km; ~19 days)
Kolberg (Kopahn)           475 km  (~593 km; ~24 days)
Olomouc (Moravia)          620 km  (~775 km; ~31 days)
Erfurt                     170 km  (~213 km; ~9 days)
Lüneburg                   146 km  (~182 km; ~7 days)

Code: see compute.py