A Thought for Calendars That Hold the Globe Together

As we gear up to ritualistically welcome another New Year (2026) by instinctively flipping old calendars — virtual or printed paper — to the new year, exchanging greetings and making resolutions and plans for the year ahead, let us pause to think about what calendars truly mean and how profoundly they impact and shape our lives.

Just as every citizen in a democracy has the right to vote, every person — whether lettered, illiterate, intellectual, or novice — uses calendar and are impacted by it. Yet most of us have never paused to appreciate that the way we divide time into calendars is a creative construct of human ingenuity, born from generations of observation, debate, conflict, compromise and calibration.

Calendars give us far more than dates; they give us coordination, continuity, and a shared temporal compass. They tie us to nature’s rhythms, underpin our economic systems, and allow us to map the past and plan the future.

At first glance, a calendar seems a simple tool: it tells us what day it is, what meeting we have, and when festivals and holidays fall. But dive deeper, and you see something far more remarkable — a universal system of time measurement that synchronizes societies, economies, rituals, and history itself.

Rooted in Nature

The calendar is one of humanity’s oldest creative tools. Its origins lie in humankind’s effort to make sense of repeating patterns in nature — the daily rising and setting of the Sun, the monthly phases of the Moon, and the Earth’s yearly orbit around the Sun. Early civilisations devised ways to divide time into units that suited their needs, whether for planting crops or scheduling religious observances. Over millennia, these systems evolved, adopted across civilisations and history and were standardised into the calendars we use today. 

The word calendar itself comes from the Latin calendarium, meaning an “account book” — a reminder that calendars were practical tools for organizing civic life as much as symbolic ones. 

Calendar do far more than mark days. They enable among other things:

• Economic planning: Businesses plan budgets, launch products, and set deadlines based on calendar years.

• Social coordination: Appointments, meetings, and public events rely on a shared structure of time.

• Cultural rhythm: Festivals, holidays, and anniversaries are organized around calendar dates.

• Historical narrative: We use years and dates to record and interpret history.

At their core, calendars are systems of temporal coordination. They allow societies to synchronise actions, economies to function predictably, cultures to preserve continuity, and states to govern coherently. Like language or currency, calendars operate as shared infrastructure — invisible when functioning smoothly, but deeply disruptive when they fail, as seen in history.

Without a common calendar, there would be no shared “when” — and without shared time, there can be no coordinated society.

The Gregorian calendar, adopted globally, refined earlier calendrical systems to balance accuracy with usability. Its leap year rules — every year divisible by 4 is a leap year, except centuries not divisible by 400 — keep our civil calendar aligned with nature’s cycles with remarkable precision.

When India attained independence, there was no unified calendar for all of India, many local variations existed. This resulted in the National Calendar Reforms Committee, which was established to recommend a unified calendar for all of India. The committee chaired by Prof Meghnad Saha, eminent scientists and a parliamentarian, formalized lunisolar calendar for all of India in which leap years coincide with those of the Gregorian calendar.

Although Gregorian calendar is used for administrative purposes, yet holidays are still determined according to regional, religious, and ethnic traditions. Years are counted from the Saka Era; 1 Saka is considered to begin with the vernal equinox of 79 AD. The reformed Indian calendar began with Saka Era 1879 AD, Caitra 1, which corresponds to 22nd March, 1957.

So, in this season of greetings, as we mark the passage from the year 2025 to 2026, let’s not just celebrate the new year — let’s also celebrate the remarkable human achievement that makes it meaningful: the calendar itself.

Happy New Year 2026.

(The writer is Senior Advisor CSMVS, Mumbai and former Director of Nehru Science Centre. Views personal.)