search

fantasycalendar / Fantasy-Calendar

Build a calendar that fits your world! Whether you're a GM just here to track your Forgotten Realms campaign with a preset calendar, or a fanciful world-builder with 12 moons (Like Eberron's) and zany timekeeping systems to match, we've got you covered.
https://app.fantasy-calendar.com
91 stars 7 forks source link

Lunar calendar support #344

Open Haxxer opened 9 months ago

Haxxer commented 9 months ago

Description

Lunar calendars are weird, and may need a different calculation approach compared to normal calendars. Normal calendars have a set number of days per month, while lunar calendars are driven by the moon's cycles. Eg. the month's length is the amount of days it takes for the moon to go from full moon to the next full moon, which may vary month to month.

tctlrd commented 3 months ago

I am using Fantasy Calander for a biblical calendar which of course follows the earth's lunar month. Alternating 30/29 day months works for the most part. A more purist way to generate months would be interesting. The year is a solar one though. So having these come together is where it gets a little tricky. The new year hinge is the Vernal Equinox. Inserting a 13th leap moon/month every 2-3 years is the current tradition to keep moons and sun in sync with spring. Currently the practice is a 19 year cycle containing seven leap years. This has issues though and is drifting the new year into the summer. This calendar is the most eligant solution I have seen: http://individual.utoronto.ca/kalendis/hebrew/rect.htm https://calendars.fandom.com/wiki/Rectified_Hebrew_calendar

I would like to see this visualized with Fantasy Calendar.