Well this is not an outcome of this image that I'd even contemplated!!
I'd also posted this image on my Astrobin page and because of that I was contacted by a member of a French astronomy society who asked if he could use my timings of 2nd and 3rd contact in conjunction with their 3rd contact timing to calculate the Sun-Earth distance.
I happily agreed and the calculated value was 154,000,000 kms - not bad!! Here's the link to the appropriate page on their website...
http://www.albireo78.com/index.php?o...1&limitstart=3
Cheers,
Mario