The teddy bears have been planning their celebrations for the Vernal Equinox ever since they first heard the term a few weeks ago.
Firstly, they found out all about what the Vernal Equinox is. You may already know that the way the Sun, the Earth and the Moon move around in relation to each other is what gives us our day and night, as well as our four seasons: Spring, Summer, Autumn and Winter.
One thing that the bears discovered is that the Earth is tilted. As it moves around the Sun, it doesn't sit straight upright with the North Pole exactly at the top and the South Pole exactly at the bottom. Instead, it leans a little to one side.
The tilt is important because it means that at certain times of the year, more of one part of the Earth is facing the Sun than at other times. This tilt gives us our seasons.