<s>
The	O
Rytz	O
’s	O
axis	O
construction	O
is	O
a	O
basic	O
method	O
of	O
descriptive	B-Language
geometry	I-Language
to	O
find	O
the	O
axes	O
,	O
the	O
semi-major	O
axis	O
and	O
semi-minor	O
axis	O
and	O
the	O
vertices	O
of	O
an	O
ellipse	O
,	O
starting	O
from	O
two	O
conjugated	O
half-diameters	O
.	O
</s>
<s>
A	O
fundamental	O
task	O
in	O
descriptive	B-Language
geometry	I-Language
is	O
to	O
draw	O
such	O
an	O
image	O
of	O
a	O
circle	O
.	O
</s>
<s>
This	O
is	O
a	O
standard	O
situation	O
in	O
descriptive	B-Language
geometry	I-Language
:	O
</s>
