  In this article, we propose a variant of the usual Ostrowski
$\alpha$-numeration (where $\alpha$ is a real in [0, 1[) that codes integers
(positive as well as negative) and reals of [0, 1[ (instead of [--$\alpha$,
1--$\alpha$[), so that for every integer n, n and {n$\alpha$} have the same
coding sequence. These coding sequences respect natural lexicographic orders
and will be used to prove well known results on order properties of Kronecker
sequences ({n$\alpha$ -- $\beta$}) n .
