PBL

Seasons

100

Why do the seasons happen?

The Earth's tilt

200

If the northern hemisphere was experiencing summer, what is the southern hemisphere experiencing right now?

Winter

300

How much degrees is the Earth's tilt?

23.5 degrees

Day and Night

100

How long is one day on Earth?

24 hours

Winter Solstice

100

Approximately, on what day does the winter solstice happen?

December 21st

Summer Solstice

100

Approximately, what day does the summer solstice happen?

June 21st

Equinoxes

100

What are equinoxes?

When Day and Night are the same length

200

When does the autumnal equinox happen?

September 22

500

How many equinoxes happen a year?

2