  At the 450 yr anniversary of its observation,the supernova named after Tycho
Brahe, SN 1572, can be explained in the terms used nowadays to characterize
Type Ia supernovae (SNe Ia). By assembling the records of the observations made
in 1572--74 and evaluating their uncertainties, it is possible to recover the
light curve and the color evolution of this supernova. It is found that, within
the SNe Ia family, the event should have been a SN Ia with a normal rate of
decline. Concerning the color evolution of SNe Ia, the most recently recovered
records reaffirm previous findings of its being a normal SN Ia. The abundance
studies from X--ray spectroscopy of the whole remnant point to a nuclear
burning of the kind of a delayed detonation explosion of a Chandrasekhar--mass
white dwarf. A tentative single degenerate path to explosion was suggested from
the exploration of the stars in the field in SN 1572. Though, the origin in a
double degenerate is being considered as well. Tycho Brahe's supernova, being
the first supernova studied by astronomers, is still the subject of very
intensive debates nowadays.
