Where our facts come from
Day, age, moon phaseCalculated from standard calendar and astronomical formulas; moon phases match NASA's published times
#1 songsUS weekly chart history since 1958
Baby namesUS Social Security Administration
Gas pricesUS Energy Information Administration (1918 to 1948 via InflationData.com)
Stamp pricesUS Postal Service rate history
Minimum wageUS Department of Labor
Home pricesUS Census Bureau, median price of new houses sold; before 1963, the 1940, 1950 and 1960 census median home value
Movie ticketsNational Association of Theatre Owners average ticket price; 1929 to 1947 estimated from box office receipts and attendance (Historical Statistics of the United States); nickelodeon admission (1905 to 1915)
New car pricesUS Bureau of Economic Analysis, average spent per new car; before 1967, list prices of popular models (Oldsmobile Curved Dash, Ford Model T and others) from Wikipedia
Computer, game system and TV pricesManufacturer launch prices and dated news and retail reports
Pop culture winnersAcademy Awards, Primetime and Daytime Emmy Awards, Nielsen TV ratings (including late-night ratings), NFL, MLB, NBA and NHL records, Kentucky Derby winners
Movies released that weekWikidata (CC0); films from 1900 to 1909 from Wikipedia's year-in-film lists
TIME Person of the YearTIME magazine
Best-selling car, truck and SUVBest Selling Cars Blog, Alan's Factory Outlet and best-selling-cars.com rankings; Ford sales reports; automaker yearly US sales
World and US populationOur World in Data (CC BY 4.0)
What Hubble saw on your birthdayNASA
Life in your yearNBER recession dates, Bureau of Labor Statistics unemployment and Consumer Price Index
Weather that dayNOAA National Centers for Environmental Information, daily station records
City lookup for weatherGeoNames (geonames.org), CC BY 4.0
Famous birthdaysWikidata (CC0)
Planet positions and retrogradesNASA Jet Propulsion Laboratory, Horizons system; planet facts from NASA fact sheets
Moon phases and eclipsesFred Espenak, NASA Goddard Space Flight Center phase and eclipse catalogs; full moon names from the Old Farmer's Almanac tradition
Zodiac sign guideStandard Western astrology associations; the moment the Sun changes sign is calculated with Jean Meeus's solar position formulas
Chinese zodiac guideLunar New Year dates from the Chinese calendar, checked against a published table; lucky numbers, colors and flowers from China Highlights
On this day in historyWikipedia, CC BY-SA 4.0
How common is your birthdayUS Social Security Administration daily birth counts 2000 to 2014, via FiveThirtyEight (CC BY 4.0)
Some figures are national averages or estimates, and we label them that way. Horoscopes and zodiac content are for entertainment.