
Candelmass is the all-purpose mid-winter celebration of the gap between solar expectations and climatic realities, famously emphasizing the theme of light. In Scotland, Candelmass, February 2, is a "quarter day." In England in general, Candelmass was one of the four days on which school fees were traditionally paid. The American folkloric ritual of observing the groundhog as he first emerges on February 2 addresses the chthonian aspects of agricultural vivification, an insurance policy for crop productivity. The relation of light to the underworld makes Groundhog Day a perfect bolagram subject.

Commentary
The most
salient feature of Groundhog day is the way it "actualizes"
the ritual itself. Within the regime of time regulated by
the solar cycle (hinged around the pole star), the difference
between the solar and lunar year is compounded in the "lack"
in the solar cycle of a quarter-day which must be made up
every four years or otherwise accommodated. The congeries
of themes that have accumulated around calendar themes is
enormous, and Groundhog Day is set within the middle of them.
Here is a brief list of the more prominent elements, garnered
from James Frazer's Golden Bough and other sources:
The dominant quality of the groundhog is "phallic," or rather "anamorphic." He appears and disappears, generates a shadow that he dissociates from himself (Narcissus) and in other ways acts in a very human manner (i.e. capable of self-deception).
In short, Groundhog Day is nothing less than an outlier of primitive traditions about the solar year, the nature of time (as containing an implicit gap or defect), and the implicit connections between disguise (anamorphosis, shadow) and natural cyclicity.