Do you have any extras you could sell ? I misplaced mine sometime around June of '97 and haven't been able to find one since.
Agreed that you can't really tack in the nautical sense but it's at least conceptually similar.
With mirrors you can adjust where on the surface light hits and therefore change the preferred direction of motion. You may not be able to sail directly toward the sun (though you might) but you could in theory tack back and forth so you had a net vector towards the sun.
There's really no reason you couldn't tack up sun. Just need some mirrors. It wouldn't be as effective as sailing down sun but it would work.
BTW, I'm really looking forward to the day that 'sailing down sun' and 'tacking up sun' is a thing.
"Hey Bob! Looks like we need to ship some anthrax to Korea."
"Ok! Did you make sure it wouldn't kill us before we start handling the samples."
"Does it really matter?"
"... No... I guess not..."
* Lentil Curry Stew
* Vietnamese chicken curry stew
* Green Chili
* Red (or "Chocolate Chipotle Imperial Stout") Chili
* Beef and truffle beef stew
* Jerk Chicken/Beef/Pork
I've found or posted a lot of these recipes in the Google+ "Crockpot Obsession" group.