You can now auto-stalk any location from space, courtesy of JavaScript

A new web tool called Watched lets you see every satellite that passed over any location on Earth in the past week, along with any photos those satellites might have taken. It runs entirely in your browser using JavaScript and WebGL to calculate the complex orbital mechanics in real-time, turning your computer into a personal mission control center.

For developers, this showcases the impressive power of modern web APIs to handle computationally intensive tasks like orbital prediction without server-side processing. For everyone else, it's now trivially easy to see exactly what satellites—commercial, government, or scientific—have been looking at your backyard, your favorite beach, or anywhere else, raising both fascinating possibilities and mild privacy paranoia. The final takeaway: Big Brother is watching, and now you can watch right back.