where to mathematicians go?

a tilted planet, orbiting its sun
has days that wax and wane throughout the year
a  normal axis sets all=one
a cosmic bicycle in one fixed gear
a metaphor for life's growths and decays
implicit in each daybreak and sunset
aligning dimming eyes with waning days
a finite bankroll carrying no debt
but cyclic functions come around again
each Spring's rebirth's as sure as Fall's decline
so poets sketch an afterlife for men
a lot like this, but of inverted sign
conjecture's free to roam where data's null
to think it's settled fact, one must be dull