On Autumn VIII

Her tilt of axis

With orbital period

Gifts us the seasons.


CLP 12/11/2018

n.b Earth’s axial tilt wobbles but the mean is currently c. 23.5 degrees. The orbital period around the Sun is our Earth year. It is described as a sidereal orbit because the Earth’s circuit of the Sun is on an orbital plane that is relatively settled during the brevity of human lifespans. Source: https://www.universetoday.com/47176/earths-axis/