1月8 Fun Holiday – Earth's Rotation Day
January 8 is Earth’s Rotation Day. The day commemorates when French Physicist, Leon Foucault, demonstrated the Earth rotates on its axis in 1851.
The Earth's axis is tilted about 23.5° with respect to its orbital plane around the Sun.
©bigstockphoto.com/vjanez
To prove his theory, Foucault suspended a lead-filled brass sphere, now called the Foucault Pendulum from the top of the Pantheon in Paris.
He showed that the plane of the swing of the pendulum rotated relative to the Earth’s rotation. You can now see the Foucault Pendulum demonstrating the rotation of the Earth in science museums around the world.
How to Celebrate?
- Visit your local space and science museum to learn more about the Earth’s rotation and what effect it has on humans.
- If you have kids, what about making a model of the Earth and the Sun with them, so that they can learn more about the Earth’s rotation?
Did You Know…
...that the speed of the Earth's rotation can change from day to day and from year to year?
Earth's Rotation Day Observances
| Fun Holiday: Earth's Rotation Day Observances | |||
|---|---|---|---|
| Year | Weekday | Date | Name |
| 2025 | 水曜日 | 1月8日 (水) | Earth's Rotation Day |
| 2026 | 木曜日 | 1月8日 (木) | Earth's Rotation Day |
| 2027 | 金曜日 | 1月8日 (金) | Earth's Rotation Day |
| 2028 | 土曜日 | 1月8日 (土) | Earth's Rotation Day |
| 2029 | 月曜日 | 1月8日 (月) | Earth's Rotation Day |
| 2030 | 火曜日 | 1月8日 (火) | Earth's Rotation Day |
| 2031 | 水曜日 | 1月8日 (水) | Earth's Rotation Day |
| 2032 | 木曜日 | 1月8日 (木) | Earth's Rotation Day |
| 2033 | 土曜日 | 1月8日 (土) | Earth's Rotation Day |
| 2034 | 日曜日 | 1月8日 (日) | Earth's Rotation Day |
