Disclaimer

Calculated data

Every moon number on this site — the phase emoji, the illumination percent, the moon age, the distance, and the eclipse dates — is calculated by a computer using well-known astronomy math (Jean Meeus' Astronomical Algorithms, 2nd edition).

Calculated data is very good, but it is not the same as standing outside and looking up. Small differences can come from your exact spot on Earth, the local weather, the time of day, and small tweaks in the math.

So if our tool says the moon is a waxing crescent and you step outside and see something a tiny bit different, that is normal. The shape is close enough that it is the same moon, just seen from your eyes in your sky.

Not for navigation or safety

Do not use this site for navigation, for sailing, for flying, for hiking at night, or for any job where a wrong number could put someone in danger.

Do not use this site for religious observance that needs very high precision (for example, moon sighting for the start of a lunar month). For those purposes, please follow the official announcement of your local moon-sighting authority.

Our tools are for fun, for learning, and for general curiosity about the moon. They are not a replacement for a real astronomical almanac, a navigation chart, or an official religious ruling.

No liability

We are not liable for any loss, harm, or trouble that comes from using the moon data on this site. You use the site at your own risk.

We do our best to keep the site working, but we do not promise it will always be online, that every link will work, or that every number will match what you see in the sky perfectly.

External links

We sometimes link to other trusted websites, like NASA's eclipse catalog or the Unicode standard. We do not control the content of those sites, and we are not responsible for what they publish.

Questions?

If you spot a number that looks wrong, please email us at moonphaseemoji@gmail.com. Tell us the page URL, the date you looked at, and what you think is wrong. We read every message and we fix real mistakes quickly.