<p>The earliest timekeepers looked to the skies for answers. The lunar calendar, based on the phases of the moon, was one of humanity’s first attempts at organizing time. Each month began with a new moon, lasting roughly 29.5 days. <a target="_blank" href="https://www.batteryequivalents.com/calculators-and-charts/months-to-years-and-years-to-months-conversion.html">5 years in months</a> But what happens when the moon doesn’t align perfectly with the solar year?</p>


The earliest timekeepers looked to the skies for answers. The lunar calendar, based on the phases of the moon, was one of humanity’s first attempts at organizing time. Each month began with a new moon, lasting roughly 29.5 days. [5 years in months](https://www.batteryequivalents.com/calculators-and-charts/months-to-years-and-years-to-months-conversion.html) But what happens when the moon doesn’t align perfectly with the solar year?

What Is a Lunar Calendar?