Calendar for Planet Xhilr

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UD/MOD double integer division in M6800 assembler within figForth.
The assembler I use to assemble it is here:
https://sourceforge.net/p/asm68c/wiki/Home/
and it can be run on Joe H Allen's exorsim v. 1.1.
Surprisingly, the High-level Forth version is only around twice as slow as the assembler-level version (because it only uses right-shifts).

Now it runs more or less correctly.

Fixing errors, a little code cleanup

at this point it more or less runs

refactoring and comments, progress

cycles and the digging into the actual calendar

debugging the division

full double division in Forth-level code

more on cycle counting for synthetic division

progress, corrections, and a detour in C

Need to remember how the moons orbit

progression

bringing things together

side path (bad days added early)

Different ways to print the day of the week

minor corrections

side paths with processors and byte order fussing

more minor stuff

minor corrections

iend of math checking path

rollback by hand

checking my math

pursuing two separate paths

shifting to period code

segfaults, FWIW

working version

Only log10 was actually relevant here.

starting in C

sans leap year check, year / 12

adding real and changing the old name to ideal