Holy Kaboley, I just found The Electric Astrolabe, at astrolabes.org! This is software that can be downloaded absolutely free. *Goes wild, cheering and yet fearing she will be unable to use the thing*
I LOVE astrolabes and wish I had one, as this speaker wishes. When he told me it would in all likelihood cost more than my entire neighborhood, my hopes were dashed. Well, truthfully, I had no hopes to dash, but nevertheless, a wild part of me wants to build one of these (the wild part does not care one whit that I have none of the skills required to build such an instrument). My heart soars as I contemplate an astrolabe, even one that is simply a pixel image on a screen. Oh, and yes, I wish there were an iPhone app astrolabe, but I searched and there is none (so far). Something to wish for!

On the Discovery Channel they are showing an aerial reforestation project, in which helicopters carry buckets of canisters containing soil and prepared black mangrove seeds. See a video primer on aerial reforestation here.