The sky is full of calculable events. When does the sun rise? Where's the moon tonight? What angle should you set your solar panels? Why is the moon made of cheese? (Okay, maybe not that one.)
These astronomy tools answer the questions that matter to anyone who's ever wondered why sunset feels earlier than it should. This collection includes sun and moon calculators, twilight tools (yes, all the types of twilight), and solar utilities for everything from panel positioning to shadow planning.
Track the sun's position, calculate sunrise and sunset, and find the perfect light. Or dark.
Moon phases, lunar distance, and the earth's distance from the sun. I mean, what more could you ask for - hit the posts and ask "how far away is the moon right now, actually?"
Practical solar applications we built for you: panel angle calculators, irradiance data, shadow length tools, and interactive maps showing day and night around the world. Everything from sundial building to time-lapse planning to optimizing your solar installation.
Looking for date math, age calculators, or time converters? Check out our Time & Date Calculators.