  The asymptotic symmetry analysis of Maxwell theory at spatial infinity of
Minkowski space with $d\geq 3$ is performed. We revisit the action principle in
de Sitter slicing and make it well-defined by an asymptotic gauge fixing. In
consequence, the conserved charges are inferred directly by manipulating
surface terms of the action. Remarkably, the antipodal condition on de Sitter
space is imposed by demanding regularity of field strength at light cone for
$d\geq 4$. We also show how this condition reproduces and generalizes the
parity conditions for inertial observers treated in 3+1 formulations. The
expression of the charge for two limiting cases is discussed: Null infinity and
inertial Minkowski observers. For the separately-treated 3d theory, a set of
non-logarithmic boundary conditions at null infinity are derived by a large
boost limit.
