20 Remember that as the Earth revolves around the Sun, its axis points in the same direction. This is why during some seasons, the northern hemisphere gets more direct sunlight, and in others, the southern hemisphere gets more sunlight.
25 Solstice:The longest day of the year (for Northern hemisphere = June 21)The shortest day of the year (for Northern hemisphere = December 21)
26 Solstice:Summer Solstice: “The longest day of the year” means when the Earth is getting the most direct sunlight for the longest period of time- Means that the Northern hemisphere is facing as close to the sun’s direct rays as possible
27 Summer Solstice 2012: In Washington, D.C. Sunrise: at 5:43 am Sunset: 8:37 pmLength of daylight hours: 14 hours, 54 minutes
28 Solstice:Winter Solstice: December 21st “the shortest day of the year” –this means that the Northern hemisphere is getting the least amount of direct sunlight during daylight hoursMeaning the Northern Hemisphere is tilted as far away from the sun’s direct rays as possible
29 Winter Solstice 2012: In Washington, D.C. Sunrise: 7:24 am Sunset: 4:50 pmLength of daylight hours: 9 hours, 26 minutes
31 What is an Equinox?An equinox is when the sun is directly hitting the equator, which means that the Northern and Southern hemispheres are getting about the same amount of sunlightBoth the Northern and Southern hemispheres have 12 hour days (equal amount of day and night)
32 EquinoxFall Equinox: September 21 (in Northern Hemisphere) – first day of FallSpring Equinox: March 21 (in Northern Hemisphere) –first day of Spring
33 Note: A season cannot officially change without a solstice or an equinox!
34 Challenge Trivia: If during the winter, the Northern Hemisphere is facing away from the sun and does not get direct sunlight, why do we still have daylight during those months?
35 Answer: Rotation!Remember that while the Earth is revolving around the sun every 365 days, it is rotating on its own axis every 24 hours!So for about 12 hours, the planet still is exposed to daylight, just NOT at a direct angle.
38 RotationCounterclockwise!THE OPPOSITE OF HOW A CLOCK’S HANDS MOVE
39 Did you know the seasons influenced how we count days, months, and years? A year is 365 ¼ days because people noticed that there were 4 seasonsWith each season change, the moon went through its full cycle 3 times4 season x 3 moon cycle per season = 12 months