I have just used a magnifying glass and cannot see the shadow of Venus. All I can see is that I have a crap lens.
Method. Put a magnifying glass near a wall. Allow the sun's rays to pass though the glass and form a shadow on the wall.
If I didn't already have one in the June photo contest I might have submitted this one (Contrast)
[qimg]http://www.internationalskeptics.com/forums/imagehosting/1714fce98f70df2d.jpg[/qimg]
How I set it up:
[qimg]http://www.internationalskeptics.com/forums/imagehosting/1714fce98f72b2b0.jpg[/qimg]
I took this using a cheap set of binoculars mounted on a tripod. I projected it onto a sheet of foamcore with a sheet of white styrene taped to it. The sun is a little oblong from shooting at an angle. You can also see sunspots, or maybe my binoculars are just really dirty.
http://i1089.photobucket.com/albums/i347/Steven_A_S/sun2.jpg
Steve S
Okay, I did look it up. The "Venusian year" is 225 days, so your 140 was 365-225. Now it makes sense - when Venus is back where it was, Earth is almost 2/3 of the way around too. So, even though Venus orbits the sun in less than a year, it isn't that much less, and it takes 2.5 years to "lap" it.
Thanks again.