"The synodic period is the time Venus takes to be seen again from the Earth in the same position with respect to the Sun (but not necessarily to the stars). It is 584 days long [...] or just over 19 months."
- European Southern Observatory
"...same position with respect to the Sun..." means roughly "in the same phase (crescent, "full," etc.)" and "in the same place in the sky at a specified clock-time."
Since 12 months (= one Earth year) does not "go evenly" into 19 months, Venus would not be seen (from Earth) to have the same phase and position in the sky relative to the Sun in the same month (or even season) in consecutive Earth years.
Q.E.D.
Regards,
So this holds true for the Northern Hemisphere of the US, southern NJ on the East Coast?
.25 to .5. Fired up my Orion SpaceProbe 130ST last night. Almost as bright or as bright as the moon only smaller. Was somewhat surprised that it was so visible here in Wichita city limits.
Will be near the moon tonight.