How do you know that the pilgrim track

Along the belting zodiac

Swept by the sun in his seeming rounds

Is traced by now to the Fishes’ bounds

And into the Ram, when weeks of cloud

Have wrapt the sky in a clammy shroud,

And never as yet a tinct of spring

Has shown in the Earth’s apparelling;

     O vespering bird, how do you know,

          How do you know?

How do you know, deep underground,

Hid in your bed from sight and sound,

Without a turn in temperature,

With weather life can scarce endure,

That light has won a fraction’s strength,

And day put on some moments’ length,

Whereof in merest rote will come,

Weeks hence, mild airs that do not numb;

     O crocus root, how do you know,

          How do you know?

“The Year’s Awakening,’’ by Thomas Hardy (1840-1928)