Earth in space: Seasons and shadows.

Revolution- ( causes seasons)

The motion of an object around a point, especially around another object or a center of mass.

Seasons

a period of the year that is distinguished by special climate conditions.

Equator

an imaginary line around the middle of a planet or other celestial body.

Middle Latitudes

the regions on Earth located between the tropics (23.5° North and South) and the polar circles (66.5° North and South)

North and South Poles

the two points on Earth where its axis of rotation intersects its surface, defining the northernmost and southernmost points respectively

Southern Hemisphere

the half of the Earth located south of the equator, an imaginary line that divides the planet into two equal halves. 

Northern Hemisphere

the half of the Earth that lies north of the equator

Indirect light - 30 degree angle

the spread of light emitted by a fixture, typically measured in degrees

Direct Light - 90 degree angle

occurs when light rays strike a surface straight on, at a 90-degree angle from the surface's normal, resulting in the most concentrated light intensity and energy absorption. 

Vernal Equinox

the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere.

Autumnal Equinox

the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.

Winter Solstice

marks the shortest day and longest night of the year in the Northern Hemisphere, occurring when the Earth's axis is tilted furthest away from the sun, causing the sun to appear at its lowest point in the sky.

Summer Solstice

marks the longest day and shortest night of the year in the Northern Hemisphere, occurring when the North Pole is tilted most directly towards the sun, around June 20th or 21st.

Horizon

the line at which the earth's surface and the sky appear to meet.

Summer Shadow

the short shadows cast during the summer months, when the sun is at its highest point in the sky, and the Earth is tilted towards the sun.

Shadow

a dark area or shape produced by a body coming between rays of light and a surface.