Thursday, September 22nd of this year will be the Autumnal Equinox. It is the time of year when the imaginary plane that might pass through the Earth's Equator would also travel through the center of the Sun. At this auspicious moment the number of sunlight hours and night time hours are about the same all over the Earth. In the Northern Hemisphere we move into the Fall season.
We love the seasons and Ecliptic animation from the Magic of Physics site. Below is a screen shot of the applet. By clicking on the link, a new window will open and students, or the teacher using a projector, can change the position of the person on the globe and other variables to enjoy a discussion of this auspicious moment.
We have three possible activities for you to use in your classrooms after playing with the Nebraska applet.
- Autumnal Equinox-chart2018.pdf - What can you deduce about the Autumnal Equinox from this line graph?
- Autumnal-Equinox-3-latitudes2018.pdf - How are the daylight hours of these three latitudes different and the same?
- Autumnal-Equinox-using-trig2018.pdf - Calculate daylight hours for any latitude with a formula involving trigonometry.
- daylight-hours-N40.xlsx - Spreadsheet and charts for various latitudes.
CCSS: 5.G.A.2, 7.G.A.3, 8.SP, HSG.MG.A.1