Relating to the study of religious festivals, celebrations, or feast days.
From Greek 'heorte' (festival or feast) and '-logical' (relating to the study of). The term emerged in theological and religious scholarship to describe systematic analysis of ceremonial observances.
Heortology is the hidden science behind why Christmas falls on December 25th and Easter bounces around every year—it's all about ancient calendar systems and religious math! Religious scholars actually need to understand astronomy, history, and mathematics to untangle how holidays were calculated.
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