Seasonal Science
Orbital Timelines
Lunar & Solar Eclipses
Tidal Forces
Earth in Space
100

This is the primary reason Earth experiences different seasons throughout the year. 

Earth's tilted axis

100

This is the exact amount of time it takes for Earth to make one complete revolution around the Sun. 

365.25 days

100

This type of eclipse occurs when the Moon passes directly between the Sun and Earth. 

Solar eclipse. 

100

This is the primary force responsible for the rising and falling of Earth's ocean levels. 

The Moon's gravity.
100

Which celestial body does Ms Robinson wish was still labeled as a planet?

Pluto

200

Earth is titled at this specific measurement on its axis. 

23.5 degrees

200

A full moon or a complete lunar cycle is observed from Earth's surface about once every this many days. 

29.5 days (or 1 month)

200

To see this event, Earth must be positioned exactly between the Sun and the Moon. 

Lunar eclipse. 

200

These tides are at their highest when the Sun, Moon, and Earth are all pulling in the same direction. 

Spring tide

200

This force is the primary reason that Earth and other planets remain in a constant orbit around the Sun instead of drifting into deep space. 

Gravity.
300

This explains why winter is colder than summer; it's not the distance from the Sun, but this factor regarding energy. 

When tilted away from the Sun, people in wintertime receive less direct heat energy from sunlight. 

300

This event, marking the start of spring or fall, occurs only twice each year. 

An equinox
300

This is the specific order of celestial bodies required for a solar eclipse to take place. 

The Sun, the Moon, the Earth

300

This term describes the exceptionally strong tides that occur during a New Moon or Full Moon phase. 

Spring tide

300

This statement accurately describes Earth's status as one of many celestial bodies that travel in a path around our central star. 

Earth is one of many planets orbiting the Sun

400

To represent summer in the Northern Hemisphere in a model, the top of the axis (skewer) must be pointed in this direction. 

Towards the Sun. 

400

On Earth, a new season begins approximately every this many months.

3 months

400

While a full moon happens every month, this specific alignment event only occurs about twice a year. 

A Lunar Eclipse. 

400

Compared to October 3rd (straight alignment), the tides October 10th (90 degree angle) would be this. 

Neap tide

400

Because of Earth's orbital position and tilt, this specific month is when Florida receives the maximum amount of sunlight energy. 

June

500

In the Southern Hemisphere, point B experiences winter while point A in the Northern Hemisphere experiences summer because of this orientation. 

Because Earth is titled on its axis and so one hemisphere is going to get more direct sunlight while the other's sunlight will be less direct. Also, because the axis will never change directions, one half of the year, the northern hemisphere will be in summer, while the opposite half of the year, the southern hemisphere will be in summer. 

500

While revolution takes 12 months, this movement of Earth on its axis takes only 24 hours. 

Rotation
500

During a lunar eclipse, the Moon is in this phase, even though it may appear dark or reddish. 

A Full Moon

500

This is the reason high tides occur on both the side of Earth facing the moon and the side directly opposite it. 

The gravitational pull of the Moon and Sun combined

500

The reason why the Northern Hemisphere experiences summer while the Southern Hemisphere simultaneously experiences winter. 

The axial tilt causing one hemisphere to receive more direct sunlight than the other