Seasons & Moon Phases

Eclipses, Umbra, Penumbra

Earth’s OrbitDecember 21

Winter Solstice

March 21

Vernal Equinox

September 23

Autumnal Equinox

June 21

Summer Solstice

Northern Hemisphere Winter

• When the pole slants away from the sun, the Northern Hemisphere receives the least sunlight and it is winter.

Summer, Spring, Autumn• Spring begins when the pole starts to

slant toward the sun, and autumn begins when the pole starts to slant away again.

• When the North Pole slants toward the sun, the Northern Hemisphere receives the most sunlight and it is summer there.

Ecliptic

Analemma

Phases of the Moon

• New Moon• Waxing Crescent• First Quarter• Waxing Gibbous• Full Moon• Waning Gibbous• Last Quarter• Waning Crescent• Moon Phase Applet• Moon Phase Calcul

ator

New Moon

Waxing Crescent

First Quarter

Waxing Gibbous

Full Moon

Waning Gibbous

Last Quarter

•Waning Crescent

Moon’s Orbit is Tilted

Solar Eclipse

Umbra to Penumbra