The Calendar We Deserve

Have you ever stopped to appreciate how wonderful the Gregorian calendar we currently use worldwide is? Ruminating pleasantly on its many positive qualities, such as the way each new year starts in the middle of winter, each month contains a nice, round 4 and 1/3 (ish) weeks, and how dates (like the 1st, 15th, or 31st) politely rotate through different weekdays every year so you never get too comfortable.

No?

Perhaps you’re too enchanted by the elegant system we use to remember month lengths: start with 31 in January and alternate between 30 and 31, except for the part where July and August are both 31 for reasons that are definitely not arbitrary, and February, which has 28 days. Usually.

But surely you appreciate the convenience of holidays defined as things like the “fourth Thursday of a month.” Or how about the way Easter, famously easy to locate, occurs on the first Sunday after the first full moon following the spring equinox. This means it can fall anywhere between March 22 and April 25, depending on a mix of astronomy and rules that were standardized in the 4th century and then adjusted again later for calendar drift. In other words: completely intuitive. Well, at least Halloween and Christmas are easy to find.

Most likely, instead, you’ve had thoughts more along the lines of:

“Why are they doing this to us?”
“Were they being stupid on purpose?” (spoiler: kind of)
“Who even are ‘they’?”

So let’s start by answering these.

How Did This Happen?

The current calendar is not the result of careful design. It is the result of accumulated patches.

The early Romans were working with something loosely based on lunar cycles and political convenience. Their calendar didn’t even include January and February at first. The year began in March, which, to be fair, is one of the few decisions in this entire story that actually makes sense. Spring starts, the temperature warms, the days lengthen, and life returns. If you were going to pick a “new year,” that would be the obvious place to put it.

The month names we still use today reflect that original structure:

• September was the 7th month
• October the 8th
• November the 9th
• December the 10th

And then we just… kept the names, even after they stopped being correct.

The system itself, however, was a mess. Months had uneven lengths, and the year didn’t properly match the solar cycle, so it drifted. To fix this, officials would occasionally insert extra days or even whole months. Conveniently, those officials were politicians, so the system was abused to extend terms of office or manipulate deadlines (purposeful stupidity).

Over time, the calendar drifted so far out of alignment with the seasons that it had to be fixed.

Enter Julius Caesar, who introduced the Julian calendar in 45 BC. This was a major improvement: a solar calendar with 365 days and a leap day every four years. Finally, something resembling structure.

Except it still wasn’t quite right. The year was about 11 minutes too long. That doesn’t sound like much, but over centuries it adds up.

By the 1500s, the calendar had drifted about 10 days relative to the seasons. This became a problem because Christian holidays (especially Easter) were tied to seasonal and astronomical events. So in 1582, Pope Gregory XIII introduced the Gregorian calendar.

And that’s the system we still use.

So what we have today is not a clean design. It’s a layered compromise of Roman politics, astronomical correction, religious requirements, and historical inertia stacked on top of each other and never really cleaned up.

Okay, It Sucks. Why Not Replace It?

People have tried.

The most serious attempt at a clean, rational system is the International Fixed Calendar.

Its tenets are very simple:

No more wondering what day anything is. No more uneven months, or broken quarters. It’s almost suspiciously sensible.

But let’s note that there are some universal difficulties here. The actual number of days for the Earth to complete a revolution around the sun is about 365.2422, so there isn’t even an exact number of days. And with the international fixed method we have 13 × 28 = 364. So we need a ‘Year Day’ attached at the end, and we still need to use the leap day system to accommodate the fractional parts of a day building up every 4 years. Year Day and Leap Day would not be weekdays and would function as special holidays outside the standard system. Which sounds awesome. And while equinoxes and solstices cannot be pinned to an exact day, the variation is tight already with the current Gregorian calendar and would remain so with the IFC (±1 day).

We will pause here to give an honorable mention to the Ethiopian calendar which has its roots in the calendar of ancient Egypt.

Sadly, the IFC isn't any good at lining up with lunar cycles (approx. 29.53 days). But there isn’t really a way of nicely lining this up under any system, so we let it go.

Apart from poorly aligned lunar cycles, the IFC would make the entire system perfectly regular. Accounting, planning, scheduling, everything becomes simpler. Sounds like a big step up. So why aren’t we using it?

The biggest issue is that treating those extra days as outside the weekly cycle interrupts the continuous seven day week. That’s a dealbreaker for religions built on an unbroken weekly rhythm. Primarily Judaism, Christianity, and Islam (Sabbath / Sunday worship / Friday prayer). So you run into resistance, not because the system fails, but because it conflicts with inherited rules that are treated as untouchable (aka being stupid on purpose).

But apart from that, every contract, fiscal system, and schedule would need adjustment, and people would have to relearn a whole new system (which everyone would be very happy to do, of course).

So in short, change is hard and religious zealots will persecute you if you try. But we can still dream. So let’s consider what an ideal calendar might look like...

You wake up on March 1st, still a bit hungover from a banger of a 24 hour celebration of Year Day the day before, looking forward to the new year beginning just as the world springs back to life. You sip your first cup of coffee and enjoy, for a moment, the freedom from religiously imposed constraints as you notice the 13 month calendar on the wall sitting there in humble defiance, every month exactly 28 days. A friend calls and asks if you will be able to see her on her upcoming birthday this year, and you easily know the answer without checking, since it is always on a Saturday. Within weeks the spring equinox arrives, right where you would expect it, soon after the year's beginning, instead of buried awkwardly inside a system that barely acknowledges it. And the moon? She gets to keep her mysterious, unboxable nature, which is better anyway. This is the calendar we deserve.