Spring equinox always arrives in what feels like the middle of winter. Snow falls in the Northwest while the Northeast tries to dig out from under the most recent storm and ice still covers Midwestern roads. Even in Los Angeles, spring does not really feel like, well, spring until sometime in late April or early May. The foundational spring stories of the Northern Hemisphere also have that hidden element.
Passover in the Jewish tradition tells the story of a people oppressed by enslavement in Egypt, the dominant empire of its time. Over and over again terrible experiences overtake the land, but the slave masters refuse to let go. A plague of frogs is not enough. Nor locusts. Nor dying animals. Nine times the plagues come and the masters will not relent. Then, suddenly, with number ten, the slaves are released, or actually, told to leave. It could have happened after the first disaster.