About ahhoh.com
ahhoh.com is a small observatory for your pocket. You turn a dial, watch the sky change, match a request, and then read the guide that explains why. The subject is the cycles of the sky: the Moon, eclipses, seasons, calendars and what you can see with your own eyes.
Who it is for
Curious people, families, students and teachers. You do not need to know any astronomy first. Each guide starts with the plain question, such as "Why does the Moon look different each night?" or "Why does the Sun rise at a different time in June?", and builds from there.
What you will find
- Forty-five guides in five categories: Moon Phases and Motion, Eclipses, Seasons and the Sun's Path, Calendars and Clocks, and Watching the Sky.
- Set the Sky, a game with five instruments, one for each category. You read a request, turn the dial until the sky matches, and lock it in. There is no timer, no daily limit and no sign-up.
- The Sky Logbook, a collection of the forty-five entries. Win a round for an entry and it is logged with a medal and a card. The logbook lives only in your own browser.
How we work
Every guide is built from official sources: NASA, the U.S. Naval Observatory, NOAA, NIST and similar institutions. We open each source ourselves and print the date we opened it at the end of the guide. Each entry is checked against at least two sources, and when they differ the guide says so. The Editorial policy and the Methodology and sources page explain the rules in full.
What we do not do
- We do not show ads, and we do not set cookies.
- We do not invent quotes, numbers, experts or reviews.
- We do not recommend products, and we have no affiliate links.
- We do not give exact predictions. The instruments are simplified models. For exact times and dates, use the official tables the guides point to.
Independent project
ahhoh.com is an independent educational site. It is not run by, or connected to, NASA, the U.S. Naval Observatory, NOAA, NIST or any other source we cite. We name them so you can check our work.
Write to us
Found a mistake, or have a question about a guide? Use the contact page or write to contato@ahhoh.com.