Calendar Wiki

Months Not Really Lunar[]

The Calendar would not follow the phases of the moon well within a year, because the months normally have 30 days, even though the lunar mean month is an accurate 29.5306221 days.

Instead, months alternating between 30 and 29 days would be better. This alternation can extend to whole year when the year is at its shortest (354 days). In a long Brumias, 15 days would be added to Januariae and Februariae as before and also the brumia intercalaris leap day according to the rules. This modification would not change the number of days in any year.

If the alternating 30 day months include Martiae, then each month would have 29, 30 or 45 days, because Februariae would have 29 days when no days are added.

The Long Brumias could be constructed of 3 months including a 30-day month of Mercedoniae (named after the Roman month of Mercodonius) after Februariae.

Karl 08:36, 30 May 2008 (UTC)

If we divide the Long Brumias into three months we'll get a standard (and boring) lunisolar calendar. The same goes for 29-30 day alteration (plus it would break the uniformity weekday-monthday correspondence).
What I designed is an "art-calendar". It's main purpose is to be interesting and "historically based". Of course its months don't follow the moon phases very well, but on the other hand who cares? Roman generals and Thracian slaves have many more important things to do than to grunt that they can see the moon on when they shouldn't. The actual Roman calendar was much worse. If anyone wants to know a more precize date of a lunar phase they can look into the perpetual calendar I've published that assigns weekdays and lunar phases to the days of the year, or they can simply memorize the "lunar drift" for every month -- it's not so difficult:
Feb: 0; Mar&Apr:+2; Mai&Jun:+1; Qui&Sex&Sep:0; Oct&Nov:–1; Dec&Jan:–2
In this calendar every year has 12 months, and most months have 30 days: this is the ideal many calendars long for. And as far as I know the "New Roman Lunisolar Calendar" is the only example of a lunisolar calendar among them. That's what makes it interesting.
Precise following the lunar phases, or solstices/equinoxes has no practical purpose -- it's usually provided for occultist reasons (well, for a century or two it was important for navigators as well). But Roman Empire was a "secular" state, where civil business was considered much more important than religious practices, and I suspect that Roman could like a calendar like this. Hellerick 17:10, 31 May 2008 (UTC)