Also, wouldn't the residents of such a planet need to know where we are in order to calculate that point in their orbit? And by extension, wouldn't they have to be intentionally trying to communicate with us specifically, as opposed to "searching" for someone capable of receiving their message? I suppose they could be continuously broadcasting in the direction facing away from their star. But to have that capability would require a huge amount of communication equipment, not to mention continuous power to said global network. If their society is similar to our own, they may face the same setbacks we on earth have to contend with. And as we know from our own history, humans can't get along with each other long enough to make a concerted effort toward any common goal, let alone such a huge undertaking as an interstellar communications network. Not to say it isn't possible. Especially for a race older than humanity. But then again, who's to say that even a more advanced civilization than ours are really that much different than us? Then again, most of our outbound signals have been entertainment related. Maybe they know exactly where we are, but the crap we're sending out isn't worth their effort to answer us.