Last Updated：2022/12/24
Figure 5-19. Sun-Venus-Orbiter geometry illustrates how the periapsis moves around the planet during the Venusian sidereal year to sample day and night hemispheres. Because the planet rotates in a retrograde direction, it takes more than one Venusian sidereal year for periapsis to move over all longitudes of the planet (as explained in text).
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Figure
5-19.
Sun-Venus-Orbiter
geometry
illustrates
how
the
periapsis
moves
around
the
planet
during
the
Venusian
sidereal
year
to
sample
day
and
night
hemispheres.
Because
the
planet
rotates
in
a
retrograde
direction,
it
takes
more
than
one
Venusian
sidereal
year
for
periapsis
to
move
over
all
longitudes
of
the
planet
(as
explained
in
text).
