Seasons

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Seasons Moon Phases

• Eclipses, Umbra, Penumbra

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Earths Orbit
March 21 Vernal Equinox
December 21 Winter Solstice
June 21 Summer Solstice
September 23 Autumnal Equinox
3
Northern Hemisphere Winter

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

4
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.

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Ecliptic
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Analemma
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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 Calculator

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New Moon
Waxing Crescent
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First Quarter
Waxing Gibbous
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Full Moon
Waning Gibbous
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Last Quarter

• Waning Crescent

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Moons Orbit is Tilted
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Solar Eclipse
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Umbra to Penumbra