themoonknows.com

Gift Ideas for Every Milestone

The perfect personalized gift for any birthday or celebration

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Milestone Birthday

30th, 40th, 50th — relive the day they entered the world

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New Baby

Document the day they arrived with stars, moon & weather

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Music Lover

"The #1 song when you were born" — a fun conversation starter

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In Memoriam

Honor a loved one by remembering the world on their special day

What's On Your Poster

A single poster packed with real data from the exact day

Star Map

The exact night sky from your birth date and location, calculated using real astronomical data.

Moon Phase

The precise lunar phase on your date — crescent, gibbous, full, or new moon.

Weather

Temperature and conditions from the Open-Meteo historical archive (data from 1940+).

#1 Song

The Billboard Hot 100 #1 song on that date — covering every week from 1958 to present.

World Facts

World population, US president, average gas price, and a fun historical fact from that year.

Day of the Week

What day of the week you were born and your birth zodiac sign.

Frequently Asked Questions

How far back does the data go?

Star maps and moon phases work for any date. Weather data goes back to 1940 via the Open-Meteo historical archive. Billboard #1 songs cover 1958 onwards. President and population data covers modern history.

Is the weather data accurate?

Weather data comes from the ERA5 reanalysis dataset via Open-Meteo, the same data used by climate researchers. It uses satellite, radar, and station data to reconstruct historical weather at 25km resolution.

Do you store my birth data?

No. Everything runs in your browser. The only external call is to fetch weather data from Open-Meteo's public API. We never see or store your personal information.