Around 4.5 billion years ago, the Earth started orbiting the sun. Since then, there have been trillions of sunsets, but humans have only been around to see about 73 million of them.

For each of those sunsets, there were people watching, awed by the colors, thinking deep thoughts. We made this app because we love that feeling so much.

After testing our forecasts empirically for years, we finally feel we’re accurate enough to help you decide when a sunset will be worth watching. But regardless of what we say, you’ll never regret going out to see a sunset.

When in doubt, check it out.