Effects of Rotation and Revolution

Earth spins or ROTATES on its axis, causing day and night (24 hours).

Earth REVOLVES around our star, the Sun (1 year).

Because Earth's axis is also tilted 23.5 degrees, the revolution creates seasons due to the uneven heating of the Earth.

The northern hemisphere is tilted toward the Sun. 

Most direct sunlight (focused)

Longer days and shorter nights. 

North pole: constant daylight South pole: constant night. 

While the north has summer, the Southern hemisphere has winter.

The axis is not pointed towards or away from the Sun. 

Equal sunlight in both hemispheres 

Equal length days and nights at the equator

While the north has fall, the Southern hemisphere has spring.

The northern hemisphere is tilted away from the Sun. 

Most indirect sunlight

Shorter days and longer nights

North pole: constant night, but South pole: constant daylight 

While the north has winter, the Southern hemisphere has summer.

The axis is not pointed towards or away from the Sun. 

Equal sunlight in both hemispheres 

Equal length days (12 hours) and nights (12 hours) at the equator

While the north has spring, the Southern hemisphere has fall.

The longest or shortest days of the year (💡 sol=>sun)

The Sun reaches its highest or lowest point in the sky at noon.

NH: Summer Solstice – June 21st

NH: Solstice – December 21st

Southern hemisphere has same solstice dates, but switched; (summer, longest day Dec. 31).

Day and night are equal at the equator (💡:eq=>equator=>equal)

The Vernal equinox – about March 20th

The autumnal equinox – about September 22nd

Since the light is equal on both hemispheres, only the names are switched between the southern and northern hemispheres.