For years we've lamented a lack of scientific literacy, especially in the U.S. where almost half the population can't even explain what causes the seasons! Now you can help end this disgrace by proudly displaying the facts:
"AXIAL TILT IS THE REASON FOR THE SEASON!"
Inside message: "Wishing you peace and prosperity on this next trip 'round the sun."
Cards are 4.25" x 6.25" with 10 cards and envelopes in each pack. Envelopes feature a beautiful illustration of an antique model of Earth showing its axial tilt, horizon, ecliptic, and five major circles of latitude (Arctic, Tropic of Cancer, Equator, Tropic of Capricorn, and Antarctic).
On the back we've included a brief description of the Earth's tilt and how it causes the seasons.